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Winkler UH, Daume E, Sudik R, Oberhoff C, Bier U, Hallmann C, Andreas JO, Schindler AE.Winkler UH, et al. Among authors: bier u.Eur J Contracept Reprod Health Care. 1999 Sep;4(3):145-54.Eur J Contracept Reprod Health Care. 1999.PMID: 10574640Clinical Trial.