1. Department of Gastroenterological Surgery; Saitama Medical University International Medical Center, Yamane 1397-1; Hidaka Saitama Japan
2. Department of Pathology; Saitama Medical University International Medical Center, Yamane 1397-1; Hidaka Saitama Japan
3. Division of Diagnostic Pathology; Tokyo Medical University, Nishishinjuku 6-7-1; Shinjuku Tokyo Japan