Funding for this research was provided by:
National Institute for Health Research (UK_ (PRP 100/0001)
Article History
Received: 25 October 2019
Accepted: 3 August 2020
First Online: 17 August 2020
Ethics approval and consent to participate
: ELSA was approved by the London Multicentre Research Ethics Committee (MREC/01/2/91), and informed consent was obtained from all participants.
: Not applicable.
: The authors declare no competing interests.