1. Department of Epidemiology and Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, China
2. Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, Nanjing Medical University, Nanjing, China
3. Department of Gastroenterology, Affiliated Hospital of Yangzhou University, Yangzhou, China
4. Digestive Endoscopy Center, The First Affiliated Hospital of Nanjing Medical University and Jiangsu Province Hospital, Nanjing, China