1. School of Health Sciences, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan
2. Division of Perinatology and Pediatrics, Department of Multidisciplinary Internal Medicine, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan
3. Division of Pediatrics, Tottori Red Cross Hospital, Tottori 680-8517, Japan
4. Department of Pediatrics, Shimane University Faculty of Medicine, Izumo 693-8501, Japan
5. Asahigawasou Rehabilitation and Medical Center, Okayama 703-8555, Japan