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Contributors WHF screened literature, data extraction of the identified studies, carried out data cleaning and statistical analysis and drafted the manuscript. MA, MM and FA screened and data extraction of the identified studies, carried out data cleaning and approved the final version of the manuscript. MHF, ATA, EAM, JA, MRG, AC-G, KM and NA screened and data extraction of the identified studies and approved the final version of the manuscript. CNS and MDW contributed to clinical expertise to the project and approved the final version. ZW approved the final version of the manuscript and contributed a methodological expertise. LJP approved the final version of the manuscript and designed the search strategy. MHM and AL conceived the idea, wrote the protocol, contributed the methodological expertise and approved the final version of the manuscript.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
▸ Additional material is published online. To view please visit the journal (http://dx.doi.org/10.1136/ebmed-2016-110522).