Attention Deficit Hyperactivity Disorder (ADHD)LANDSCAPENCT04943796
A Study to Learn About the Occurrence of ADHD in Adults With Mental Conditions and Their Quality of Life
An observational study of Attention Deficit Hyperactivity Disorder (ADHD), run by Takeda at 14 sites in 6 countries.
Trial summary
The main aim of the study is to find out how frequently adults with at least one psychiatric condition have ADHD (but have not been diagnosed with ADHD before) and to describe the quality of life of these adults who have been diagnosed with ADHD. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Attention Deficit Hyperactivity Disorder (ADHD)
- How many people
- 224 participants
- Where
- 14 sitesin 6 countries
- Study dates
- 6 Nov 2023to 28 Jul 2025
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Participants with diagnosis of any of the following psychiatric disorder: Major depressive disorder (MDD), Anxiety disorders (AD), Bipolar disorders (BD), Substance use disorders (SUD), Border line disorder and Binge eating disorder.
Who may be able to join
- Part I:
- Adult greater than or equal to (>=)18 years of age or Canadian adult >=19 years of age
- Ability to consent, as judged by the study investigator
- Diagnosis of at least one psychiatric disorder of at least 12 months duration, based on International classification of diseases (ICD)-10 codes registered in electronic health records
- Consecutive assessment for ADHD (as per routine clinical practice)
- Able to read and write in the first language of the respective country
Show all 9Show fewer
- Part II
- Diagnosis of ADHD during Part I, according to routine diagnostic procedure and algorithms
- Anticipated availability for being followed over 9 months
Who cannot join
- Part I:
- Diagnosis of any of the following at any time prior to signing informed consent: schizoaffective disorder, intellectual disability, or other cognitive disorders
- Occurrence of any of the following events within the 6 months prior to signing consent: psychotic episodes, acute intoxication, or psychotropic drug withdrawal syndrome.
- Diagnosis of ADHD at any time before study inclusion
- Serious and unstable medical condition (severe disease that limits survival to 1 year)
- Participation in a clinical interventional trial in the 12 months prior signing consent
- Part II:
- Participant being followed-up for ADHD in a different site
Trial locations and contacts
14 sites in 6 countries.
14 sites in 6 countries
Germany4 sites
Charité - Universitätsmedizin Berlin
Berlin, 10117
Klinik und Poliklinik für Psychiatrie und Psychoterapie
Bonn, 53127
Universitätsklinikum Frankfurt am Main
Frankfurt am Main, 60596
Asklepios Klinikum Hamburg
Hamburg, 21075
Canada3 sites
Pacific Coast Recovery Care
Burnaby, British Columbia, V3N3N4
Regina Mental Wellness Clinic
Regina, Saskatchewan, S4P0W6
Hopital de Psychiatrie de Trois-Rivières, Pavillon St-Joseph
Trois-Rivières, Quebec, G9A 5Z9
Spain3 sites
Hospital Vall d'Hebron
Barcelona, 08035
Clínica Dr. Quintero
Madrid, 28002
Hs. Infanta Elena
Madrid, 28342
United Kingdom2 sites
Cumbria Northumb, Tyne & Wear FT, Adult Psychiatry Dept
Newcastle upon Tyne, NE3 3XT
Tees Esk and Wear Valley foundation
York, YO31 8TA
About this study
Official title: Prevalence of ADHD and Health Outcomes in Adult Outpatients With Psychiatric Disorders: a Multi-country, Two-part, Observational Study
The main aim of the study is to find out how frequently adults with at least one psychiatric condition have ADHD (but have not been diagnosed with ADHD before) and to describe the quality of life of these adults who have been diagnosed with ADHD. To find out how often ADHD is not diagnosed in these adults could provide awareness about this condition and could help to improve preventing underdiagnosis.
- Medical subject headings
- Attention Deficit Disorder with Hyperactivity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Part I: Participants with ADHD | Participants with psychiatric disorders undergoing ADHD diagnosis. | |
| Part II: Participants with ADHD | To collect pseudonymized data from participants who are underdiagnosed of ADHD with psychiatric disorders in daily clinical practice for up to 9 months from both Part I and II. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Part I: Percentage of Participants With Positive or Negative ADHD Diagnosis
Percentage of participants with positive or negative ADHD diagnosis will be reported.
Measured: At baseline
Part II: Change From Baseline in Quality of Life- questionnaire (AAQoL) by Overall Psychological/Psychiatric Clinical Management
AAQoL (32) is an instrument designed to evaluate the quality of life in ADHD adult participants It has 29 items organized in four domains: Life Productivity (11 items); Psychological Health (6 items), Life Outlook (7 items) and Relationships (5 items). Each item is rated with a five-point Likert scale ranging from 1= Not at all/Never to 5=Extremely/Very Often. Total and domain-specific scores are computed by reversing scores for all items, except those in the Life Outlook domain; transforming all item scores to a 0 to100 point scale (1=0; 2=25; 3=50; 4=75; 5=100); and summing the item scores and dividing by them by item count. Total score ranges from 0 to 100 with higher score representing better quality of life. Change from baseline in AAQoL by overall psychological/psychiatric clinical management will be reported.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Change From Baseline in AAQoL by ADHD-Specific Clinical Management
AAQoL (32) is an instrument designed to evaluate the quality of life in ADHD adult participants It has 29 items organized in four domains: Life Productivity (11 items); Psychological Health (6 items), Life Outlook (7 items) and Relationships (5 items). Each item is rated with a five-point Likert scale ranging from 1= Not at all/Never to 5=Extremely/Very Often. Total and domain-specific scores are computed by reversing scores for all items, except those in the Life Outlook domain; transforming all item scores to a 0 to100 point scale (1=0; 2=25; 3=50; 4=75; 5=100); and summing the item scores and dividing by them by item count. Total score ranges from 0 to 100 with higher score representing better quality of life. Change from baseline in AAQoL by ADHD-Specific Clinical Management will be reported.
Measured: Baseline, 3-month, and 9-month follow up
Secondary outcomes (14)
Part I: Percentage of Participants With Confirmed Diagnosis of ADHD Based on Adult ADHD Self-Reporting Scale (ASRS)
ASRS is designed to evaluate for severity of symptoms as specified in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). ASRS is composed of 18 questions, and uses a scale that ranges from 0-4 based on the individuals mark in either the "never, rarely, sometimes, often, very often" column for a possible total score of 72. The minimum score to qualify for study inclusion is 8 (i.e. 4 or more "symptom-positive" answers), and the maximum possible score is 72. The higher the score, the more indicative of higher severity of ADHD symptoms. Each column is used to describe the severity of the individuals symptoms based on the questions asked. Each participant is asked to make a mark within one column for each question that best describes their answer. Percentage of participants with confirmed diagnosis of ADHD in participants with psychiatric disorder based on adult ASRS will be reported.
Measured: At baseline
Part I: Percentage of Participants With Confirmed Diagnosis of ADHD Based on Diagnostic Interview for Adult ADHD (DIVA 5.0)
DIVA 5.0 is a structured diagnostic interview for Adult ADHD, and is based on the criteria for ADHD in DSM-5. Whenever possible the DIVA should be completed with adults in the presence of a partner and/or family member, to enable retrospective and collateral information to be ascertained at the same time. The DIVA usually takes around one and a half hours to complete. The DIVA only asks about the core symptoms of ADHD required to make the DSM-IV diagnosis of ADHD, and does not ask about other co-occurring psychiatric symptoms, syndromes or disorders. In this study, participant will be interviewed using DIVA only if scores in ASRS showed positive diagnosis of ADHD.
Percentage of participants with confirmed diagnosis of ADHD in participants with psychiatric disorder based on DIVA 5.0 will be reported.
Measured: At baseline
Part I: Percentage of Participants With Confirmed Diagnosis of ADHD Based on Diagnostic and Statistical Manual of Mental Disorders (DSM-5)
DSM-5 confirm the diagnosis of ADHD if meeting all of the following criteria: (i) having five out of nine ADHD inattention and/or hyperactivity/impulsivity symptoms for the last 6 months or more; (ii) having several symptoms before the 12 years of age; (iii) having several symptoms in at least two settings (e.g., at home or work; and with friends or family members); (iv) having symptoms interfering with quality of social, academic, or occupational functioning; and (v) having symptoms that do not occur exclusively during the course of a psychotic disorder and are not better explained by another mental disorder.
Percentage of participants with confirmed diagnosis of ADHD in participants with psychiatric disorder based on DSM-5 will be reported.
Measured: At baseline
Part II: Number of Modalities for Non-ADHD Psychiatric/Psychological clinical management
Number of modalities for non-ADHD psychiatric/psychological clinical management will be assessed.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Type of Treatment Given to Participants with ADHD for Non-ADHD Psychiatric/Psychological Clinical Management
Type of treatment given to participants with ADHD for non-ADHD psychiatric/psychological clinical management will be assessed.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Duration of Treatment for Non-ADHD Psychiatric/Psychological Clinical Management
Duration of treatment for non-ADHD psychiatric/psychological clinical management will be assessed.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Number of Modalities for ADHD-specific Psychiatric/Psychological Clinical Management
Number of modalities for ADHD-specific psychiatric/psychological clinical management will be assessed.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Type of Treatment Given to Participants with ADHD for ADHD-Specific Overall Psychiatric/Psychological Clinical Management
Type of treatment given to participants with ADHD for ADHD-specific overall psychiatric/psychological clinical management will be assessed.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Duration of Treatment for ADHD-Specific Psychiatric/Psychological Clinical Management
Duration of treatment for ADHD-specific psychiatric/psychological clinical management will be assessed.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Change From Baseline in Functional Assessment Short Test (FAST) Score
FAST is a brief instrument designed to assess the main functioning problems experienced by psychiatric participants, particularly bipolar participants. It comprises 24 items that assess impairment or disability in six specific areas of functioning: autonomy, occupational functioning, cognitive functioning, financial issues, interpersonal relationships and leisure time. The scale used to evaluate functionality is the FAST Scale, the minimum value being 0 and maximum value of 72, domain scores are scaled in a negative direction (i.e. lower scores denote higher functionality).
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Change From Baseline in Clinical Global Impressions Scale- Severity of Illness (CGI-S)
CGI-S is a 7-point scale to rate the participant's severity of illness at the time of assessment, relative to the clinician's past experience with participants who have the same diagnosis by means of one question: Considering your total clinical experience with this particular population, how mentally ill is the participant at this time which is rated on the following seven-point scale with range from 1 to 7 were: 1=normal, not at all ill; 2=borderline mentally ill; 3=mildly ill; 4=moderately ill; 5=markedly ill; 6=severely ill; 7=among the most extremely ill participants.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Change From Baseline in Clinical Global Impressions Scale- Improvement (CGI-I) Score
CGI-I is a 7-point scale that requires the clinician to assess how much the participant's illness has improved or worsened relative to a baseline state at the beginning of the intervention: Compared to the participant's condition at admission to the project [prior to medication initiation], this participant's condition ranges from 1 to 7 were: 1=very much improved since the initiation of treatment; 2=much improved; 3=minimally improved; 4=no change from baseline (the initiation of treatment); 5=minimally worse; 6= much worse; 7=very much worse since the initiation of treatment.
Measured: Baseline, 3 Month and 9-Month of follow-up
Change From Baseline in Health Resource Utilization (HRU)
Utilization of health resources by the study population during the 12 months prior ADHD assessment in the total sample and according to the diagnosis will be assessed at baseline, 3-months and 9 months follow up.
Measured: Baseline, 3 Month and 9-Month of follow-up
Part II: Functionality Level and Quality of Life by ADHD-Specific Clinical Management
Continues variables (e.g., age, functionality scores, quality of life scores, number of previous visits to the hospital) and categorical variables (e.g., sex, clinical characteristics, psychiatric disorders, ADHD warning signs, treatments, previous tests) will be described in the total sample and according to confirmed/no confirmed ADHD; and will be compared using T-test or ANOVA test (continues variables) and Chi squared test (categorical variables).
Measured: Baseline, 3-month, and 9-month follow up
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted29 Jun 2021
- Study start6 Nov 2023
- Primary completion28 Jul 2025
- Study completion28 Jul 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Attention Deficit Hyperactivity Disorder (ADHD)Studies of the same condition, open and under way.
- More trials run by TakedaThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 224 participants (actual)
Sponsor and investigators
- Lead sponsor
- Takeda
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- Study Director, Study director, Takeda
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04943796
- Sponsor's protocol ID
- TAK-489-4004
- Other IDs
- MACS-2020-070101
- Acronym
- LANDSCAPE
- Status last verified
- Oct 2025
- First submitted
- 28 Jun 2021
- Last updated
- 14 Oct 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.
Study at a glance
From the registry record, last updated by the sponsor on 14 Oct 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Prevalence of ADHD and Health Outcomes in Adult Outpatients With Psychiatric Disorders: a Multi-country, Two-part, Observational Study
- ClinicalTrials.gov ID
- NCT04943796
- Acronym / sponsor ID
- LANDSCAPE / TAK-489-4004
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 224 participants (actual)
- Lead sponsor
- TakedaIndustry (pharma, biotech, devices)
- Study start
- 6 Nov 2023 (actual)
- Primary completion
- 28 Jul 2025 (actual)
- Study completion
- 28 Jul 2025 (actual)
- First posted
- 29 Jun 2021 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The main aim of the study is to find out how frequently adults with at least one psychiatric condition have ADHD (but have not been diagnosed with ADHD before) and to describe the quality of life of these adults who have been diagnosed with ADHD. To find out how often ADHD is not diagnosed in these adults could provide awareness about this condition and could help to improve preventing underdiagnosis.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Part I: Participants with ADHD | – | –Participants with psychiatric disorders undergoing ADHD diagnosis. |
| Part II: Participants with ADHD | – | –To collect pseudonymized data from participants who are underdiagnosed of ADHD with psychiatric disorders in daily clinical practice for up to 9 months from both Part I and II. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Participants with diagnosis of any of the following psychiatric disorder: Major depressive disorder (MDD), Anxiety disorders (AD), Bipolar disorders (BD), Substance use disorders (SUD), Border line disorder and Binge eating disorder.
Key inclusion criteria (9 listed)
- Adult greater than or equal to (>=)18 years of age or Canadian adult >=19 years of age
- Ability to consent, as judged by the study investigator
- Diagnosis of at least one psychiatric disorder of at least 12 months duration, based on International classification of diseases (ICD)-10 codes registered in electronic health records
- Consecutive assessment for ADHD (as per routine clinical practice)
- Able to read and write in the first language of the respective country
Key exclusion criteria (8 listed)
- Diagnosis of any of the following at any time prior to signing informed consent: schizoaffective disorder, intellectual disability, or other cognitive disorders
- Occurrence of any of the following events within the 6 months prior to signing consent: psychotic episodes, acute intoxication, or psychotropic drug withdrawal syndrome.
- Diagnosis of ADHD at any time before study inclusion
- Serious and unstable medical condition (severe disease that limits survival to 1 year)
- Participation in a clinical interventional trial in the 12 months prior signing consent
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Part I: Percentage of Participants With Positive or Negative ADHD Diagnosis
Time frame: At baseline
Percentage of participants with positive or negative ADHD diagnosis will be reported.
Part II: Change From Baseline in Quality of Life- questionnaire (AAQoL) by Overall Psychological/Psychiatric Clinical Management
Time frame: Baseline, 3 Month and 9-Month of follow-up
AAQoL (32) is an instrument designed to evaluate the quality of life in ADHD adult participants It has 29 items organized in four domains: Life Productivity (11 items); Psychological Health (6 items), Life Outlook (7 items) and Relationships (5 items). Each item is rated with a five-point Likert scale ranging from 1= Not at all/Never to 5=Extremely/Very Often. Total and domain-specific scores are computed by reversing scores for all items, except those in the Life Outlook domain; transforming all item scores to a 0 to100 point scale (1=0; 2=25; 3=50; 4=75; 5=100); and summing the item scores and dividing by them by item count. Total score ranges from 0 to 100 with higher score representing better quality of life. Change from baseline in AAQoL by overall psychological/psychiatric clinical management will be reported.
Part II: Change From Baseline in AAQoL by ADHD-Specific Clinical Management
Time frame: Baseline, 3-month, and 9-month follow up
AAQoL (32) is an instrument designed to evaluate the quality of life in ADHD adult participants It has 29 items organized in four domains: Life Productivity (11 items); Psychological Health (6 items), Life Outlook (7 items) and Relationships (5 items). Each item is rated with a five-point Likert scale ranging from 1= Not at all/Never to 5=Extremely/Very Often. Total and domain-specific scores are computed by reversing scores for all items, except those in the Life Outlook domain; transforming all item scores to a 0 to100 point scale (1=0; 2=25; 3=50; 4=75; 5=100); and summing the item scores and dividing by them by item count. Total score ranges from 0 to 100 with higher score representing better quality of life. Change from baseline in AAQoL by ADHD-Specific Clinical Management will be reported.
14 secondary outcomes
Part I: Percentage of Participants With Confirmed Diagnosis of ADHD Based on Adult ADHD Self-Reporting Scale (ASRS)
Time frame: At baseline
Part I: Percentage of Participants With Confirmed Diagnosis of ADHD Based on Diagnostic Interview for Adult ADHD (DIVA 5.0)
Time frame: At baseline
Part I: Percentage of Participants With Confirmed Diagnosis of ADHD Based on Diagnostic and Statistical Manual of Mental Disorders (DSM-5)
Time frame: At baseline
Part II: Number of Modalities for Non-ADHD Psychiatric/Psychological clinical management
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Type of Treatment Given to Participants with ADHD for Non-ADHD Psychiatric/Psychological Clinical Management
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Duration of Treatment for Non-ADHD Psychiatric/Psychological Clinical Management
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Number of Modalities for ADHD-specific Psychiatric/Psychological Clinical Management
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Type of Treatment Given to Participants with ADHD for ADHD-Specific Overall Psychiatric/Psychological Clinical Management
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Duration of Treatment for ADHD-Specific Psychiatric/Psychological Clinical Management
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Change From Baseline in Functional Assessment Short Test (FAST) Score
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Change From Baseline in Clinical Global Impressions Scale- Severity of Illness (CGI-S)
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Change From Baseline in Clinical Global Impressions Scale- Improvement (CGI-I) Score
Time frame: Baseline, 3 Month and 9-Month of follow-up
Change From Baseline in Health Resource Utilization (HRU)
Time frame: Baseline, 3 Month and 9-Month of follow-up
Part II: Functionality Level and Quality of Life by ADHD-Specific Clinical Management
Time frame: Baseline, 3-month, and 9-month follow up
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 14 Oct 2025.
- To obtain more information on the study, click here/on this linkLink provided by the sponsor.
- Individual participant dataSharing planned: Yes. Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Study Director study director
Takeda
14 sites in 6 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Attention Deficit Hyperactivity Disorder (ADHD), run by Takeda at 14 sites in 6 countries.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 9 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 14 Oct 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 14 sites in Germany, Canada, Spain, United Kingdom, Sweden and 1 more country. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Part I: Percentage of Participants With Positive or Negative ADHD Diagnosis (time frame: At baseline). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 14 Oct 2025.