Affiliation: | Department of Anesthesiology, The Affiliated Hospital of Qingdao University Medical College Qingdao 266000, People''s Republic of China;Department of Anesthesiology, The Affiliated Hospital of Qingdao University Medical College Qingdao 266000, People''s Republic of China;Department of Anesthesiology, Nan Fang Hospital, The South Medical University, Guangzhou 510515, People''s Republic of China;Department of Anesthesiology, Nan Fang Hospital, The South Medical University, Guangzhou 510515, People''s Republic of China;Department of Anesthesiology, The Affiliated Hospital of Qingdao University Medical College Qingdao 266000, People''s Republic of China |