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. Author manuscript; available in PMC: 2014 Apr 10.
Published in final edited form as: Cochrane Database Syst Rev. 2009 Apr 15;(2):CD000111. doi: 10.1002/14651858.CD000111.pub3

Figure 2.

Figure 2

Risk of bias summary: review authors’ judgements about each risk of bias item for each included study.