Institution: | (1) The Division of Pediatric Surgery, Iwaki Kyoritsu General Hospital, Uchigo Mimayamachi Kusehara 16, 973 Iwaki city, Japan;(2) The Departement of Pediatric Surgery, Tohoku University School of Medicine, 1-1 Seiryocho, Aoba-ku, 980 Sendai, Japan;(3) The Division of Pediatric Surgery, National Sendai Hospital, 2-8-8 Miyaginoku, 983 Sendai, Japan |