1. Department of Geriatrics, Xinhua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
2. Department of Information Management, School of Management, Shanghai University, Shanghai, China
3. School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
4. Department of Geriatrics, Shanghai Fourth People’s Hospital affiliated to Tongji University, Shanghai, China
5. China Institute for Urban Governance, Shanghai Jiao Tong University, Shanghai, China