1. Department of Anesthesia and Perioperative Medicine, The First Affiliated Hospital of Air Force Medical University , Xi’an, Shaanxi , People’s Republic of China
2. Department of Anesthesiology, Rizhao International Heart Hospital , Rizhao, Shandong , People’s Republic of China
3. Department of Cardiovascular Surgery, The First Affiliated Hospital of Air Force Medical University , Xi’an, Shaanxi , People’s Republic of China
4. Central Medical Branch of PLA General Hospital , Beijing , People’s Republic of China
5. Department of Anesthesiology, Rizhao Traditional Chinese Medicine Hospital , Rizhao, Shandong , People’s Republic of China
6. Department of Cardiology, PLA Rocket Force Characteristic Medical Center , Beijing , People’s Republic of China