[1] Chinese Peoples Liberat Army Gen Hosp, Med Ctr 1, Med Sch Chinese PLA, Dept Gastroenterol & Hepatol, Beijing 100853, Peoples R China
[2] Hainan Hosp PLA Gen Hosp, Dept Geriatr, Sanya 572013, Hainan, Peoples R China
[3] Chinese Peoples Liberat Army Gen Hosp, Med Ctr 1, Med Sch Chinese PLA, Dept Gastroenterol & Hepatol, Beijing 100853, Peoples R China
[4] Hainan Hosp PLA Gen Hosp, Dept Gastroenterol & Hepatol, Sanya 572013, Hainan, Peoples R China
[5] Chinese Peoples Liberat Army Gen Hosp, Med Ctr 1, Dept Gastroenterol & Hepatol, Beijing 100853, Peoples R China
[6] Chinese Peoples Liberat Army Gen Hosp, Med Ctr 1, Dept Gastroenterol & Hepatol, 28 Fuxing Rd, Beijing 100853, Peoples R China