1. Medical Center for Digestive Diseases, The Second Affiliated Hospital of Nanjing Medical University, Nanjing 210011, China
2. Center for Disease Control and Prevention, Wuxi 214000, China
3. State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, The Fourth Military Medical University, Xi’an 710032, China
4. Department of Biostatistics, School of Public Health, Nanjing Medical University, Nanjing 211100, China