1. Department of Hematology, Japan Community Healthcare Organization (JCHO) Tokyo Yamate Medical Center, Japan
2. Department of Gastroenterology, JCHO Tokyo Yamate Medical Center, Japan
3. Department of Surgery, JCHO Tokyo Yamate Medical Center, Japan
4. Clinical Research Center, Nagoya Medical Center, National Hospital Center, Japan
5. Department of Pathology, JCHO Tokyo Yamate Medical Center, Japan