1. Department of Cardiology, Huanghua Boai Hospital, Affiliate of Oriental College of Beijing University of Traditional Chinese Medicine, Huanghua, Hebei, China
2. Department of Cardiology, Shijiazhuang Great Wall Hospital of Integrated Traditional Chinese and Western Medicine, Shijiazhuang, Hebei, China
3. Center for Coronary Artery Disease, Division of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Chaoyang District, Beijing, China