1. Department of Obstetrics and Gynecology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
2. Department of Obstetrics and Gynecology, Rakuwakai Otowa Hospital, Kyoto 607-8062, Japan
3. Diabetes Center, Tokyo Women’s University School of Medicine, Tokyo 162-8666, Japan
4. Department of Diabetes and Endocrinology, Shin-Koga Hospital, Kurume 830-8522, Japan
5. Saiseikai Central Hospital, Tokyo 108-0073, Japan
6. Department of Maternal Internal Medicine, Osaka Medical Center and Research Institute for Maternal and Children Health, Osaka 594-1101, Japan
7. Department of Obstetrics and Gynecology, Miyazaki University School of Medicine, Miyazaki 889-1692, Japan
8. Department of Obstetrics and Gynecology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
9. Suzuka University of Medical Science, Suzuka 513-3670, Japan