Suzman Richard, Beard John R, Boerma Ties, Chatterji Somnath
Division of Behavioral and Social Research, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA.
Department on Ageing and Life Course, WHO, Geneva, Switzerland.
Lancet. 2015 Feb 7;385(9967):484-6. doi: 10.1016/S0140-6736(14)61597-X. Epub 2014 Nov 6.