1. Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China.
2. Department of Medicine, 8th Hospital of PLA, Rikaze, Tibet, China.
3. Department of Medicine, 41st Hospital of PLA, Shannan, Tibet, China.
4. Department of Anesthesiology, 41st Hospital of PLA, Qingdao, Shandong, China.
5. Departments of Surgery and Pathology, Duke University Medical Center, Durham, North Carolina, USA.