1. Department of Sociology Central South University Changsha China
2. Sau Po Centre on Ageing The University of Hong Kong Hong Kong Hong Kong
3. Fuwai Hospital National Center for Cardiovascular Disease Chinese Academy of Medical Sciences & Peking Union Medical College Fuwai Hospital Beijing China
4. School of Health Humanities Peking University Beijing China
5. Department of Hematology, Xiangya Hospital Central South University Changsha China