Text and Data Mining valid from 2019-02-14
Received: 5 December 2018
Accepted: 19 January 2019
First Online: 14 February 2019
Compliance with ethical standards
: All authors declare no potential conflict of interest.
: The design of the study complied with the Code of Ethics of the World Medical Association (Declaration of Helsinki,1964). Ethical approval was granted by the UK research ethics committee (Ref:17/EM/0079).
: All participants provided a written informed consent.