Funding for this research was provided by:
Medical Research Council (MR/K025643/1)
Health Technology Assessment Programme (10/50/65)
Received: 12 April 2017
Accepted: 13 December 2017
First Online: 25 January 2018
Ethics approval and consent to participate
: Ethical approval for this study was granted by the South-West – Frenchay Research Ethics Committee (12/SW/0161). All patients were informed about the study and invited to participate. Only those returning a completed consent form were then posted a round 1 questionnaire. For professionals, a round 1 questionnaire was provided with initial study information and invitation to participate; in this instance the return of a completed questionnaire was deemed consent to participate, as agreed by the local ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.