Received: 4 March 2021
Accepted: 11 June 2021
First Online: 28 July 2021
: The Age 46 Survey, including the collection of blood, was approved by the Health. Research Authority’s London - Central Research Ethics Committee.Participants provided verbal consent during the interviews. Before the interviews, study members were sent an advance letter advising them about the survey. The letter was accompanied by detailed information about the survey and the cohort members were free to request further information, or to opt out of the survey at this point. Also, the cohort members could request further information or refuse involvement during all the survey process, including when the interviewer attempted to make an appointment to visit, when the interviewer visited and at any point during the administration of any elements of the surveys. The verbal consent was approved as it was a routine since the beginning of the cohort, in 1970.
: Not applicable.
: All authors have completed the ICMJE uniform disclosure form at ExternalRef removed and declare no financial relationships with any organisations that might have an interest in the submitted work in the previous 3 years; no other relationships or activities that could appear to have influenced the submitted work.