@article{Crimmins2009,
author = {Crimmins, E.M. and Hayward, M.D. and Hagedorn, A. and Saito, Y. and Brouard, N.},
title= {Change in disability-free life expectancy for Americans 70 years old and older*},
year = {2009},
doi = {10.1353/dem.0.0070},
journal = {Demography},
volume = {46},
number = {3},
pages = {627--646},
}