1. Department of Anesthesiology, The Seventh Medical Center to Chinese PLA General Hospital, Beijing 100700, China
2. Anesthesia and Operation Center, The First Medical Center to Chinese PLA General Hospital, Beijing 100853, China
3. Department of Burn and Plastic Surgery, The Fourth Medical Center to Chinese PLA General Hospital, Beijing 100048, China
4. Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Air Force Military Medical University, Xi'an 710032, China