1) Department of Pediatric Surgery, Chiba University, Chiba, Japan
2) Department of Pediatric Surgery, Kagoshima University, Kagoshima, Japan
3) Department of Pediatric Surgical Oncology and Surgery, National Center for Child Health and Development, Tokyo, Japan
4) Department of Pediatric Surgery, Jichi Medical University, Shimono, Japan
5) Department of Pediatric Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
6) Committee of Board Certification, Japanese Society of Pediatric Surgeons, Tokyo, Japan

Tomoro Hishiki¹⁾⁶⁾, Satoshi Ieiri²⁾⁶⁾, Akihiro Yoneda³⁾⁶⁾, Shigeru Ono⁴⁾⁶⁾, Tatsuro Tajiri⁵⁾⁶⁾