. 2016 Jun 10;7(4):433–446. doi: 10.1002/jrsm.1215
© 2016 The Authors. Research Synthesis Methods Published by John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.