1. Department of Obstetrics and Gynecology (A.K., M.O., T.T., H.K., H.I., K.M., J.H., T.K., A.M., Y.M.), Osaka University Medical School, Suita, Osaka 565, Japan
2. Department of Obstetrics and Gynecology (K.K., M.I.), Kanazawa University Medical School, Kanazawa, Ishikawa 920, Japan
3. Kissei Pharmaceutical Company Ltd (M.K., M.A.), Minamiazumi, Nagano 399–83, Japan