1. Department of Epidemiology and Biostatistics, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences School of Basic Medicine Peking Union Medical College Beijing China
2. Center for Health Statistics and Information National Health Commission of the People's Republic of China Beijing China
3. Department of Gastroenterology, Key Laboratory of Gut Microbiota Translational Medicine Research, Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China