University of Southern California School of Medicine and Women's Hospital Los Angeles County/USC Medical Center Los Angeles, California Dr. Westgren was supported in part by grants obtained from the Swedish Medical Research Council K84-17R-6945, K84-17F-6945-01 and the Foundations of Margaretahemmet Allmanna. Correspondence: LMR Westgren, MD, Karolinska Institutet, Department of Obstetrics and Gynecology, Danderyds Hospital, 182 88 Danderyd, Sweden.
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Westgren et al. (1985) studied this question.