Funding for this research was provided by:
Health Technology Assessment Programme (12/138/02)
Text and Data Mining valid from 2018-04-13
Received: 14 August 2017
Accepted: 6 March 2018
First Online: 13 April 2018
Change Date: 12 July 2018
Change Type: Correction
Change Details: It has been highlighted that in the original article  there is a typesetting mistake in the name of I. Fakoya. This was incorrectly captured as F. Fakoya. This correction article clarifies the correct name of the author.
Ethics approval and consent to participate
: This research was undertaken in accordance with the Declaration of Helsinki and was approved by the University College London Ethics Committee (Project ID 3321/001). All participants read a study information sheet gave signed consent to participate in this research.
: As a part of the consenting process, all participants were asked for consent to use non-attributable quotes in publications. Other than this, no individual data, images or videos of participants have been published.
: The authors declare they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.