Funding for this research was provided by:
National Institute for Health Research (CDF-2016-09-014)
Received: 24 June 2019
Accepted: 15 September 2019
First Online: 13 November 2019
Ethics approval and consent to participate
: Ethical approval for this study was granted by the London School of Hygiene and Tropical Medicine Observational Research Ethics Committee , the London Bridge Research Ethics Committee and Health Research Authority [17/LO/0872]. All participants provided written consent after receiving study information and assurance of confidentiality.
: All data provided is anonymised. All names attributed to qualitative excerpts are pseudonyms. Qualitative interview participants provided written consent for anonymised narrative excerpts to be published.
: The authors declare that they have no competing interests.