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From the Department of Obstetrics and Gynecology, College of Physicians and Surgeons, Columbia University, and the Sloane Hospital for Women, Columbia-Presbyterian Medical Center, New York, N. Y. Presented in part at the District II Meeting of the American Academy of Obstetrics and Gynecology, April 2, 1955, and at the Section of Obstetrics and Gynecology of the New York Academy of Medicine, New York City, May 24, 1955. A debt of gratitude is owed to Dr. D. A. D'Esopo for his timely and critical suggestions as well as his encouragement and interest, and to the attending, resident and nursing staffs of the Sloane Hospital for Women for their cooperation in this study.
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Emanuel A. Friedman (1955) studied this question.
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