1 Department of Cardiology, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Fuwai Hospital, Beijing, China.
2 Emergency and Critical Care Center, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Fuwai Hospital, Beijing, China.
3 Department of Geriatric Cardiology, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China.