1. Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
2. National Clinical Research Center for Cardiovascular Diseases, Beijing 100029 China
3. Department of Epidemiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
4. International Quality Improvement Department, American Heart Association, Dallas, TX 07076, USA
5. Division of Cardiology, Geffen School of Medicine at University of California, Los Angeles CA 90024, USA
6. Division of Cardiology, University of North Carolina, Chapel Hill, NC 27599, USA
7. Department of Cardiology, Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool L143PE, UK
8. Department of Clinical Medicine, Aalborg University, Aalborg 9000, Denmark