Cochrane Collaboration, Cochrane Database of Systematic Reviews
DOI: 10.1002/14651858.cd002817.pub2
Wiley, Cochrane Library, 2013
DOI: 10.1002/14651858.cd002817.pub4
Cochrane Collaboration, Cochrane Database of Systematic Reviews
DOI: 10.1002/14651858.cd002817.pub3
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