Funding for this research was provided by:
University of Reading (GS16-123, 2017)
Text and Data Mining valid from 2020-04-17
Received: 7 October 2019
Accepted: 12 April 2020
First Online: 17 April 2020
Ethics approval and consent to participate
: Ethical approvals were not required as the study was a systematic review of peer-reviewed journal studies and studies published in books.
: Not applicable.
: Dr. Rosemary Lim is an Associate Editor of the journal <i>BMC Health Services Research</i>. All other authors declare that they have no competing interests.