Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, Texas Correspondence: James W. Van Hook, MD, Associate Professor, Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Texas Medicine Branch, 301 University Boulevard, 3.400 JSA, Galveston, TX 77555–0587. E-mail: [email protected]
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James W. Van Hook (2002) studied this question.
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