Funding for this research was provided by:
Health Services and Delivery Research Programme (16/48/07)
Received: 17 June 2019
Accepted: 4 December 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: Ethical approval to undertake this study was obtained from the NHS Health Research Authority on 1 August 2017 (North West - Greater Manchester East Research Ethics Committee REC reference 17/NW/0426). A consent form was sent in the post or electronically for completion and return prior to the interviews taking place.
: Not applicable.
: The authors declare that they have no competing interests. JS is an Editorial Board member on this journal.