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Smith CA, Levett KM, Collins CT, Dahlen HG, Ee CC, Suganuma M.Smith CA, et al. Among authors: collins ct.Cochrane Database Syst Rev. 2018 Mar 28;3(3):CD009290. doi: 10.1002/14651858.CD009290.pub3.Cochrane Database Syst Rev. 2018.PMID: 29589380Free PMC article.Review.
Smith CA, Collins CT, Cyna AM, Crowther CA.Smith CA, et al. Among authors: collins ct.Cochrane Database Syst Rev. 2006 Oct 18;2006(4):CD003521. doi: 10.1002/14651858.CD003521.pub2.Cochrane Database Syst Rev. 2006.PMID: 17054175Free PMC article.Review.
Smith CA, Crowther CA, Collins CT, Coyle ME.Smith CA, et al. Among authors: collins ct.Obstet Gynecol. 2008 Nov;112(5):1067-74. doi: 10.1097/AOG.0b013e31818b46bb.Obstet Gynecol. 2008.PMID: 18978107Clinical Trial.
Smith CA, Collins CT, Crowther CA, Levett KM.Smith CA, et al. Among authors: collins ct.Cochrane Database Syst Rev. 2011 Jul 6;(7):CD009232. doi: 10.1002/14651858.CD009232.Cochrane Database Syst Rev. 2011.PMID: 21735441Updated.Review.
Smith CA, Levett KM, Collins CT, Crowther CA.Smith CA, et al. Among authors: collins ct.Cochrane Database Syst Rev. 2011 Dec 7;(12):CD009514. doi: 10.1002/14651858.CD009514.Cochrane Database Syst Rev. 2011.PMID: 22161453Updated.Review.
Smith CA, Levett KM, Collins CT, Jones L.Smith CA, et al. Among authors: collins ct.Cochrane Database Syst Rev. 2012 Feb 15;(2):CD009290. doi: 10.1002/14651858.CD009290.pub2.Cochrane Database Syst Rev. 2012.PMID: 22336862Review.
Smith CA, Levett KM, Collins CT, Armour M, Dahlen HG, Suganuma M.Smith CA, et al. Among authors: collins ct.Cochrane Database Syst Rev. 2018 Mar 28;3(3):CD009514. doi: 10.1002/14651858.CD009514.pub2.Cochrane Database Syst Rev. 2018.PMID: 29589650Free PMC article.Review.