The Cochrane database of systematic reviews (2015) - Comments
pubmed: 25742878  doi: 10.1002/14651858.cd005083.pub4  issn: 1469-493x  issn: 1465-1858 

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Andrew B Jull, Nicky Cullum, Jo C Dumville, Maggie J Westby, Sohan Deshpande, Natalie Walker