[1] Weinan Cent Hosp, Dept Digest Dis, Weinan 714000, Shaanxi, Peoples R China
[2] Weinan Cent Hosp, Dept Anesthesiol, Weinan 714000, Shaanxi, Peoples R China
[3] Fourth Mil Med Univ, Clin Med Res Ctr Hematol Dis Shaanxi Prov, Tangdu Hosp, Dept Hematol, Xian 710038, Shaanxi, Peoples R China