. 2016 Mar 11;46(8):1581–1596. doi: 10.1017/S0033291716000258
© Cambridge University Press 2016
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fig. 1.
Meta-analysis search results and flow chart.