1. School of Public Health, Central South University, Changsha, China
2. School of Biomedical Sciences, Charles Sturt University, New South Wales, Australia
3. School of Health Sciences, Faculty of Medicine, Nursing and Health Sciences, Flinders University, South Australia, Australia
4. Center for Global Health, Central South University, Changsha, China
5. Institute of Gerontology, Hunan Geriatric Hospital, Changsha, China