Funding for this research was provided by:
Marie Curie (C38812/A12533)
Received: 12 December 2019
Accepted: 3 June 2020
First Online: 22 July 2020
Ethics approval and consent to participate
: The transparent expert consultation received ethical review and approval from King’s College London Research Ethics Committee (ref no. BDM/10/11-90). All participants who took part provided informed consent. The systematic review included previously published studies. We could not influence the design of the prior studies upon which this work is based and cannot comment on individual ethics approval or consent.
: Not applicable.
: The authors declare that they have no competing interests.