1. Department of Pediatrics; Yamagata University Faculty of Medicine; Yamagata Japan
2. Department of Immunology; Yamagata University Faculty of Medicine; Yamagata Japan
3. Second Department of Surgery; Yamagata University Faculty of Medicine; Yamagata Japan
4. Department of Pathology; Yamagata University Faculty of Medicine; Yamagata Japan
5. Department of Pathology and Immunology; and Pathology in Pediatrics; Washington University in St. Louis; St. Louis MO
6. Division of Pathology; Children's National Medical Center; Washington DC