Affiliation: | 1. Department of Anesthesiology, First Affiliated Hospital, China Medical University, Shenyang, China;3. Department of Cardiac Surgery, First Affiliated Hospital, China Medical University, Shenyang, China;2. Department of Anesthesiology, Liaoning Cancer Hospital and Institute, Shenyang, China;4. Department of Health Statistics, School of Public Health, China Medical University, Shenyang, China |