Funding for this research was provided by:
Kings College London
Text and Data Mining valid from 2019-04-26
Received: 20 February 2019
Accepted: 11 April 2019
First Online: 26 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All research was conducted in line with the Declaration of Helsinki and was approved in advance by the Institutional Ethics Committee.
: Informed consent was provided by all participants.