Department of Cardiology, Peking University People's Hospital, Beijing, China. Department of Gerontology, Chinese PLA General Hospital, Medical School of Chinese PLA, Beijing, China. Department of Cardiology, The Second Xiangya Hospital of Central South University, Changsha, China. Institute of Epidemiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China. Department of Cardiology, Peking Union Medical College Hospital, Beijing, China. Department of Cardiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China. Outcome Research, Merck Sharp & Dohme (China) Holding Ltd., Shanghai, China. Medical Affairs, Merck Sharp & Dohme (China) Holding Ltd., Shanghai, China.