1. Smith JP (2012) Preparing for population aging in Asia—strengthening the infrastructure for science and policy. Aging in Asia: Findings from New and Emerging Data Initiatives, eds Smith JP Majmundar M (National Academy of Sciences, Washington, DC), pp 17–35
2. Department of Economic and Social Affairs, United Nations (2009) World Population Prospects—The 2008 Revision, Volume 1, Comprehensive Tables (Department of Economic and Social Affairs, United Nations, New York), Working Paper No. ESA/P/WP210
3. Health in an unequal world;Marmot;Lancet,2006
4. HelpAge International (2014) Social pensions database. Available at www.pension-watch.net/about-social-pensions/about-social-pensions/social-pensions-database/. Accessed November 10, 2014
5. Barrientos A Lloyd-Sherlock P (2002) Non-contributory Pensions and Social Protection (International Labour Organization, Geneva), Issues in Social Protection Discussion Paper 12