Department of Emergency Medicine;
Beijing Anzhen Hospital;
Capital Medical University;
Beijing Institute of Heart Lung and Blood Vessels;
Beijing;
China;
Key Laboratory of Geriatrics;
Beijing Hospital & Beijing Institute of Geriatrics;
Ministry of Health of China;
Beijing;
China;
Graduate School of Peking Union Medical College;
the Key Laboratory of Geriatrics;
Beijing Hospital & Beijing Institute of Geriatrics;
Chinese Ministry of Health;
Beijing;
China;