. 2012 Aug 23;17:10.3402/meo.v17i0.18398. doi: 10.3402/meo.v17i0.18398
© 2012 Marie C. Morris et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License, permitting all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fig. 1.
Flowchart of search and selection strategy – PRISMA (21).