1. Department of Cardiology; Affiliated Yixing People's Hospital of Jiangsu University; People's Hospital of Yixing City; Yixing China
2. Department of Epidemiology; School of Public Health; Nanjing Medical University; Nanjing China
3. Department of Clinical Epidemiology; Geriatric Hospital of Nanjing Medical University; Jiangsu Province Geriatric Institute; Nanjing China
4. Division of Communicable Disease Control; Huai's Centre for Disease Control and Prevention; Huaian China