1. School of Nursing, Nanjing Medical University, Nanjing 211166, China
2. Geriatric Hospital of Nanjing Medical University, Nanjing 210009, China
3. School of Public Health, Nanjing Medical University, Nanjing 211166, China
4. Chengdu Center for Disease Control and Prevention, Chengdu 610041, China
5. MaiGaoQiao Community Health Service Center, Nanjing 210028, China