Departments of Obstetrics and Gynecology and Genetics, Hospital of the University of Pennsylvania and Children's Hospital of Philadelphia, Philadelphia, Pennsylvania This work was supported by the National Institute of Health Training Grant GM-07511. Reprint requests to: Alan E. Donnenfeld, MD, Dept of Ob Gyn and Genetics, Hospital of the University of Pennsylvania, 3400 Spruce St., Philadelphia, PA 19104.
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Donnenfeld et al. (1987) studied this question.