1. Department of Gastroenterology, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
2. Institute for Cancer Genetics, and Department of Pathology and Cell Biology, and Herbert Irving Comprehensive Cancer Center, College of Physicians & Surgeons, Columbia University, New York, NY 10032, USA
3. Department of Gastroenterology, Suzhou Ninth People's Hospital, Suzhou 215200, China