This research is funded by the National Institute for Health Research (NIHR) School for Primary care Research (SPCR) (ref 414). The views expressed are those of the author(s) and not necessarily those of the National Institute for Health Research (NIHR) School for Primary Care Research (SPCR).

 

Sponsor: University of Bristol (ref 2996)

Ethical approval: Wales Research Ethics Committee 1 (ref: 18/WA/0413)