Funding for this research was provided by:
Research for Patient Benefit Programme (PB-PG-0214-33007)
Received: 2 March 2019
Accepted: 17 July 2019
First Online: 23 July 2019
Ethics approval and consent to participate
: The study has been approved by the London – City Road and Hampstead Research Ethics Committee on the 26 February 2016 (reference: 16/LO/0071). The Central Ethics Committee has approved recruitment in all the recruitment centres involved. Informed written consent was obtained from all participants in this study, all of whom were over the age of 16.
: Participants completed consent forms and were aware of plans for publication; all information has been anonymized.
: The authors declare that they have no competing interests.