[1] Fudan Univ, Huadong Hosp, Dept Anesthesiol, 221 West Yan An Rd, Shanghai 200040, Peoples R China
[2] Peoples Hosp Shigatse City, Dept Anesthesiol, Tibet, Peoples R China
[3] Fudan Univ, Huadong Hosp, Dept Surg Intens Care Unit, Shanghai, Peoples R China
[4] Fudan Univ, Huadong Hosp, Dept Gastrointestinal endoscopy, Shanghai, Peoples R China
[5] Fudan Univ, Huadong Hosp, Dept Oncol, 221 West Yan An Rd, Shanghai 200040, Peoples R China