Received: 21 October 2019
Accepted: 12 December 2019
First Online: 5 February 2020
Ethics approval and consent to participate
: Minimal risk registration was granted by the King’s College London research ethics office (MRA-18/19-11127).Consent from individual respondents was obtained prior to their completion of the survey.
: The authors give consent for publication.
: The authors declare that they have no competing interests.