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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptNIH Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
Prev Med. Author manuscript; available in PMC Jul 1, 2009.
Published in final edited form as:
Prev Med. Jul 2008; 47(1): 3–16.
Published online Feb 20, 2008. doi: 10.1016/j.ypmed.2008.02.014
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Figure 1
Selection process for the 75 RCTs included in the final sample from all studies retrieved.