1. Department of Obstetrics and Gynecology; Shikoku-chuo Japan
2. Department of Pediatrics; Shikoku Central Hospital of the Mutual Aid Association of Public School Teachers; Shikoku-chuo Japan
3. Department of Pediatrics; Ehime University Graduate School of Medicine; Toon Japan
4. Department of Obstetrics and Gynecology; Tokushima University Graduate School of Biomedical Sciences; Tokushima Japan