Text and Data Mining valid from 2019-04-03
First Online: 3 April 2019
Compliance with Ethical Standards
: JB and CM were supported in the preparation and submission of this paper by the HEOM Theme of the NIHR CLAHRC Yorkshire and Humber: ExternalRef removed. The views expressed are those of the author(s), and not necessarily those of the NHS, the NIHR or the Department of Health. CM, DR, SH, AR, RW, RA and JB have no conflicts of interests to declare.
: Full data extracted from each of the studies is available in the electronic supplements.