1. The Key Laboratory of Geriatrics, Beijing Hospital & Beijing Institute of Geriatrics, Chinese Ministry of Health, Beijing, China.
2. Department of Geriatrics, the First Affiliated Hospital of Jiamusi University, Jiamusi, China.
3. Clinical Medical School, Jiamusi University, Jiamusi, China.
4. Department of Cardiology, the First Affiliated Hospital of Jiamusi University, Jiamusi, China.
5. Department of Emergency Medicine, Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessels, Beijing, China.