1 Department of Gastroenterology, Key Laboratory of Gut Microbiota Translational Medicine Research, Chinese Academy of Medical Sciences, Peking Union Medical College Hospital, Beijing 100730, China.
2 Department of Epidemiology and Biostatistics, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing 100005, China.
3 Department of Gastroenterology, Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, China.