[1] Fourth Mil Med Univ, Xijing Hosp, State Key Lab Canc Biol, Xian 710032, Shaanxi Prov, Peoples R China
[2] Nanjing Mil Command, PLA, Nanjing Gen Hosp, Dept Digest Dis, Nanjing 210002, Jiangsu Prov, Peoples R China
[3] Fudan Univ, Huashan Hosp, Dept Digest Dis, Shanghai 200040, Peoples R China