1. Health Services and Systems Research, Duke-NUS Medical School Singapore , Singapore , Singapore
2. Department of Sociology and Anthropology, and Centre for Family and Population Research (CFPR), National University of Singapore , Singapore , Singapore
3. Population Division, Department of the Economic and Social Affairs, United Nations, New York, United States of America
4. Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore , Singapore , Singapore
5. Singapore Institute for Clinical Sciences, Agency for Science Technology and Research (A*STAR) , Singapore , Singapore