[1] Natl Res Ctr Rehabil Tech Aids, Rehabil Hosp, Dept Anesthesiol, Beijing, Peoples R China
[2] Chinese Acad Med Sci, Dept Anesthesiol, Plast Surg Hosp, 33 Ba Da Chu Rd Shi Jing Shan Dist, Beijing 100144, Peoples R China
[3] Peking Union Med Coll, 33 Ba Da Chu Rd Shi Jing Shan Dist, Beijing 100144, Peoples R China