1. Department of Cardiology, Air Force Medical Center, People's Liberation Army, Beijing 100142, P.R. China
2. Department of Cardiology, The Seventh Medical Centre of The People's Liberation Army General Hospital, Beijing 100700, P.R. China
3. Department of Cardiology, Beijing Chest Hospital Heart Center, Capital Medical University, Beijing 101149, P.R. China
4. Department of Cardiology, Tangdu Hospital Affiliated to The Fourth Military Medical University, Xi'an, Shaanxi 710038, P.R. China