Funding for this research was provided by:
National Institute for Health Research (102/0001)
Received: 7 May 2021
Accepted: 26 August 2021
First Online: 6 September 2021
: The study received ethical approval from the London School of Hygiene & Tropical Medicine’s Research Ethics Committee on 21st March 2017 (reference 1204–1). Since all survey participants were signed-up members of a long-standing survey panel, the ethics committee approved a process which would evidence respondent consent by their voluntary act of completing the online questionnaire or by answering the questions through a telephone interview. All focus group participants provided signed consent.
: Not applicable.
: The authors declare that they have no competing interests.