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Publisher's Note: Error in Table S1

Posted by PLOS_ONE_Group on 15 Sep 2011 at 22:28 GMT

exclusion.
http://plosone.org/article/info:doi/10.1371/journal.pone.0021828#article1.body1.sec5.supplementary-material1.caption1.p1

There is an error in the heading of Table S1. It should read: Table S1: Twenty-nine studies excluded from the review and reasons for exclusion. The corrected Table S1 can be viewed here: http://www.plosone.org/corrections/pone.0021828.s001.cn.doc

No competing interests declared.