Funding for this research was provided by:
Medical Research Council (Network of Hubs for Trials Methodology Research (HTMR) (MR/L004933/1-R34), Collaboration and innovation in Difficult or complex randomised Controlled Trials – G0800800)
Received: 10 April 2019
Accepted: 10 June 2020
First Online: 18 June 2020
Ethics approval and consent to participate
: The study was approved by the University of Bristol Faculty of Medicine and Dentistry Research Ethics Committee. NHS research governance approval was gained where data collection took place on NHS premises or included NHS staff. All interview participants gave written informed consent.
: Written informed consent was obtained from all participants for publication of their anonymised data and individual details in publications and presentations arising from this study. Care has been taken care to anonymise participants and trials, such that they will not be identifiable in the paper. The Consent Forms are held by the authors and available for review by the Editor-in-Chief.
: The authors declare that they have no competing interests.