1. Department of Pediatrics, Nippon Medical School Hospital
2. Department of Obstetrics and Gynecology, Nippon Medical School Hospital
3. Department of Neonatology, Nippon Medical School Musashikosugi Hospital
4. Department of Neonatology, Katsushika Red Cross Maternity Hospital
5. Department of Obstetrics and Gynecology, Nippon Medical School Chiba Hokusoh Hospital