Affiliation: | 1. Department of Obstetrics and Gynecology, Faculty of Medicine, Chiba University, Inohana 1-8-1, Chiba, 280, Chiba, Japan 2. Department of Obstetrics and Gynecology, Faculty of Medicine, Keio University, Shinanomachi 35, Shinjukuku, 160, Tokyo, Japan 3. Research Laboratories, Behringwerk AG, D-3550, Marburg/Lahn, Federal Republic of Germany
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