[1] Peoples Hosp Liaoning Prov, Dept Endoscop Diag & Therapy, Shenyang 110016, Liaoning, Peoples R China
[2] Peoples Hosp Liaoning Prov, Dept Anesthesia, Shenyang 110016, Liaoning, Peoples R China
[3] Fudan Univ, Zhongshan Hosp, Endoscopy Ctr, 180 Fenglin Rd, Shanghai 200032, Peoples R China