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Piaggio G, Elbourne D, Schulz KF, Villar J, Pinol AP, Gülmezoglu AM; WHO Research Group to evaluate Misoprostol in the Management of the Third Stage of Labour.Piaggio G, et al. Among authors: schulz kf.BMC Med Res Methodol. 2003 Oct 3;3:19. doi: 10.1186/1471-2288-3-19.BMC Med Res Methodol. 2003.PMID: 14525622Free PMC article.