Department of Obstetrics and Gynecology, New York University School of Medicine, New York, New York Correspondence: Lila E. Nachtigall, MD, Department of Obstetrics and Gynecology, New York University School of Medicine, 251 East 33rd Street, New York, NY 10016. E-mail: [email protected]
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Nachtigall et al. (2004) studied this question.
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