1. Department of Gastroenterology, Nanjing Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu, China
2. Department of Gastroenterology, People's Hospital of Anji, Huzhou, China
3. Department of Pathology, Nanjing Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu, China
4. Department of Gastrointestinal Surgery, Nanjing Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, Jiangsu, China
5. Department of General Surgery, Nanjing Drum Tower Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu, China
6. Department of Pathology, VA Boston Healthcare System and Harvard Medical School, Boston, MA, United States