1. Department of Pediatric Surgery, Kitakyushu City Yahata Hospital, Kitakyushu, Japan.
2. Department of Pediatric Surgery, Research Field in Medical and Health Sciences, Medical and Dental Area, Research and Education Assembly, Kagoshima University, Kagoshima, Japan.
3. Department of Surgery, Center for Gastroenterology and Liver Disease, Kitakyushu City Yahata Hospital, Kitakyushu, Japan.