. 2014 Jun 11;180(1):29–40. doi: 10.1093/aje/kwu113
© The Author 2014. Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited
Figure 1.
Flow diagram showing the search strategy used in the current review.