1. Cardiology Department, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China;
2. Department of Cardiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China;
3. Gongren Hospital, Tangshan, Hebei Province, China;
4. Kailuan General Hospital, Tangshan, China;
5. Irving, Texas, USA