Department of Gastroenterology and Hepatology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing 100071, China;
Department of Gastroenterology and Hepatology, Institute of Digestive Diseases, Chinese People's Liberation Army General Hospital, Beijing 100853, China;
Department of Gastroenterology and Hepatology, Institute of Digestive Diseases, Chinese People's Liberation Army General Hospital, Beijing 100853, China;
Department of Gastroenterology and Hepatology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing 100071, China;
Department of Gastroenterology and Hepatology, Tonghua Hospital, Tonghua, Jilin 134001, China;
Department of Gastroenterology and Hepatology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing 100071, China;