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Chabbert-Buffet N, Chassard D, Ochsenbein E, Thomas JL, Christin-Maitre S.Chabbert-Buffet N, et al. Among authors: chassard d.Eur J Contracept Reprod Health Care. 2011 Apr;16(2):76-84. doi: 10.3109/13625187.2011.554923. Epub 2011 Feb 21.Eur J Contracept Reprod Health Care. 2011.PMID: 21332383Clinical Trial.