1. Department of Pediatric Surgery, Faculty of Medicine; Kagawa University; Kagawa Japan
2. Department of Pediatrics, Faculty of Medicine; Kagawa University; Kagawa Japan
3. Department of Perinatology and Gynecology, Faculty of Medicine; Kagawa University; Kagawa Japan
4. Department of Pediatrics; Takamatsu Red Cross Hospital; Kagawa Japan
5. Department of Diagnostic Pathology, Faculty of Medicine; Kagawa University; Kagawa Japan