1. School
of Public Health, Key Laboratory of Public Health Safety of Ministry
of Education, Fudan University, Shanghai, 200032 China
2. Department
of Geriatrics, The Affiliated Taizhou Hospital of Wenzhou Medical University, Linhai City, Zhejiang, 317000, China
3. Department
of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada KIN 6N5