1. Department of Obstetrics and Gynecology, Keio University, School of Medicine, Tokyo 160-8582, Japan
2. Department of Internal Medicine, Keio University School of Medicine, Tokyo 160-8582, Japan
3. Department of Pediatrics, Keio University, School of Medicine, Tokyo 160-8582, Japan
4. Department of Endocrinology, Tokyo Health Service Association, Tokyo 162-8402, Japan