1. Department of Pediatrics, Osaka University Graduate School of Medicine, Osaka, Japan
2. Department of Pediatrics, Japan Community Health Care Organization, Osaka Hospital, Osaka, Japan
3. Clinical Research Institute, National Hospital Organization, Kyoto Medical Center, Kyoto, Japan
4. Department of Pathology, Osaka University Graduate School of Medicine, Osaka, Japan
5. Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan