1. State Key Laboratory of Cardiovascular Disease, Arrhythmia Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
2. Department of Cardiology, Peking University Third Hospital, Beijing, China
3. Department of Cardiology, Hospital of the University of Pennsylvania, Spruce Street, Founders 9, Philadelphia, PA 19104, USA
4. Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
5. Department of Cardiology, Asklepios Klinik St Georg, Hamburg, Germany