Text and Data Mining valid from 2018-09-06
Received: 23 March 2018
Accepted: 29 August 2018
First Online: 6 September 2018
Ethics approval and consent to participate
: The study was granted ethical approval by the University College London Research Ethics Committee (reference number 7151/001). Written informed consent was obtained to participate in the study was obtained from participants.
: 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.