1. Department of Epidemiology and Statistics College of Public Health Zhengzhou University Zhengzhou China
2. Department of Digestive Endoscopy Shuguang Hospital Shanghai University of Traditional Chinese Medicine Shanghai China
3. Department of Biochemistry Second Military Medical University Shanghai China
4. Department of Environmental Health Second Military Medical University Shanghai China
5. Department of Colorectal Surgery Changhai Hospital Second Military Medical University Shanghai China
6. Department of Gastrointestinal Surgery/Clinical Nutrition Beijing Shijitan Hospital Capital Medical University Beijing China