1. Hwa Mei Hospital, Key Laboratory of Diagnosis and Treatment of Digestive System Tumors of Zhejiang Province (L.P., R.Z., T.Z., Y.J., L.H.), University of Chinese Academy of Sciences, Ningbo, Zhejiang, PR China.
2. Department of Global Health, Ningbo Institute of Life and Health Industry (L.P., R.Z., T.Z., Y.J., L.H.), University of Chinese Academy of Sciences, Ningbo, Zhejiang, PR China.
3. Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, PR China (L.W.).