1 Department of Gastroenterology, The 940 Hospital of Joint Logistic Support Forces of PLA, Lanzhou, Gansu, 730050, China; First School of Clinical Medical, Gansu University of Chinese Medicine, Lanzhou, Gansu, 730000, China.
2 Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, Gansu, 730030, China.
3 Department of Outpatient, The 940 Hospital of Joint Logistic Support Forces of PLA, Lanzhou, Gansu 730050, China.
4 Department of Gastroenterology, The 940 Hospital of Joint Logistic Support Forces of PLA, Lanzhou, Gansu, 730050, China. Electronic address: zhangjiucong@163.com.