1. Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York, USA
2. Department of Medicine, Division of Gastroenterology, Jichi Medical University, Shimotsuke, Japan
3. Gastroenterology, Hepatology and Nutrition Service, Memorial Sloan Kettering Cancer Center, New York, New York, USA
4. Division of Endoscopy, Shizuoka Cancer Center, Shizuoka, Japan