6International Labor Organization. Extending Social Protection in Health through Community Based Health Organizations: Evidence and Challenges [ A ]. Discussion Paper. International Labour Office : Geneva, 2002.
7Elmendorf D W, Sheiner L M. Should America save for its old age? Fiscal policy, population aging and national saving [J]. Journal of Economic Perspectives,2000,14(3):57-74.
8Bohn H. Will social security and medicare remain viable as the U. S. population is aging [R]. CESIFO Working Paper, 2003.
9Lee R, Edwards R. The fiscal effect of population aging in the U. S: Assessing the uncertainties[R]. NBER Working Paper, 2002.
10Miller T. Increasing longevity and medicare expenditure [J]. Demography, 2001,38 (2) :215-226.