1. Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
2. Department of Neonatology, General Perinatal Medical Center, Hospital of University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
3. Department of Pathology and Oncology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan
4. Department of Obstetrics and Gynecology, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan