Funding for this research was provided by:
Research for Patient Benefit Programme (PB-PG-0613-31099)
Received: 20 June 2019
Accepted: 20 August 2019
First Online: 3 September 2019
Ethics approval and consent to participate
: A favourable ethical opinion for the study was received from South West - Central Bristol NHS Research Ethics Committee Ref: 15/SW/0085. All participants signed a written consent form prior to taking part.
: Not applicable.
: The authors declare that they have no competing interests.