1. Department of Obstetrics and Gynecology; Tokushima Prefectural Central Hospital; 1-10-3 Kuramoto-cho 770-8539 Tokushima Japan
2. Department of Obstetrics and Gynecology; Institute of Health Biosciences, The University of Tokushima Graduate School; 770-8503 Tokushima Japan
3. Endo's Clinic for Women; 779-3233 Tokushima Japan
4. Ladies Clinic COSMOS; 780-0842 Kochi Japan
5. Department of Obstetrics and Gynecology; Health Insurance Naruto Hospital; 772-8503 Tokushima Japan