@article{Crimmins2016,
author = {Crimmins, E.M. and Zhang, Y. and Saito, Y.},
title= {Trends over 4 decades in disability-free life expectancy in the United States},
year = {2016},
doi = {10.2105/AJPH.2016.303120},
volume = {106},
number = {7},
pages = {1287--1293},
}