1 Department of Pediatrics, Tokushima Prefectural Central Hospital, 1-10-3 Kuramoto-cho, Tokushima, Tokushima, 770-8539, Japan. satomikobayashi3103@yahoo.co.jp.
2 Department of Pediatrics, Tokushima Prefectural Central Hospital, 1-10-3 Kuramoto-cho, Tokushima, Tokushima, 770-8539, Japan.
3 Department of Pediatric Surgery and Pediatric Endoscopic Surgery, Tokushima University Hospital, Tokushima, Japan.