Funding for this research was provided by:
Wellcome Trust (1516ISSFIRA26)
Received: 23 July 2019
Accepted: 30 December 2019
First Online: 24 January 2020
Ethics approval and consent to participate
: The study was approved by the University of Birmingham the Science, Technology, Engineering and Mathematics Ethical Review Committee (Reference ERN_16-0568S). Written or recorded verbal consent was obtained from the participants.
: Not applicable.
: MC has received personal fees from PCORI, Astellas, Takeda, Glaukos, and Merck outside the submitted work. SF receives income from freelance writing and lecturing and is a fellow for Evidence and Values with the Royal College of General Practitioners. GT, IL and OLA have no competing interests.