Funding for this research was provided by:
National Institute for Health Research (Oxford Biomedical Research Centre, Oxford Diagnostic Evidence Cooperative (DEC))
Article History
Received: 13 July 2017
Accepted: 29 January 2018
First Online: 12 February 2018
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests. HD has published mapping studies assessed in this review and was an author on the MAPS publication.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.