. 2017 Aug 22;12(8):e0183639. doi: 10.1371/journal.pone.0183639
© 2017 Tartari et al
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Fig 1. Study selection according to PRISMA statement.
