Affiliation: | a Children's Medical Center, Showa University Northern Yokohama Hospital, Kanagawa 224-8503, Japan b Department of Pathology, Showa University Northern Yokohama Hospital, Kanagawa 224-8503, Japan c Department of Surgery, Showa University Fujigaoka Hospital, Kanagawa 224-8503, Japan d Department of Pediatric Surgery, Showa University Hospital, Kanagawa 224-8503, Japan |