1. Affilaited Hospital, Second Military Medical University, Shanghai, China
2. Department of Epidemiology, Second Military Medical University, Shanghai, China
3. Department of Chronic Diseases, Center for Diseases Control and Prevention of Yangpu District, Shanghai, China
4. Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
5. Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou, China
6. Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China