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Ryan RE, Prictor MJ, McLaughlin KJ, Hill SJ.Ryan RE, et al. Among authors: hill sj.Cochrane Database Syst Rev. 2008 Jan 23;(1):CD003717. doi: 10.1002/14651858.CD003717.pub2.Cochrane Database Syst Rev. 2008.PMID: 18254029Updated.Review.
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Ryan R, Santesso N, Hill S, Lowe D, Kaufman C, Grimshaw J.Ryan R, et al. Among authors: hill s.Cochrane Database Syst Rev. 2011 May 11;(5):CD007768. doi: 10.1002/14651858.CD007768.pub2.Cochrane Database Syst Rev. 2011.PMID: 21563160Updated.Review.