@article{Freedman2002,
author = {Freedman, V. A. and Martin, L. G. and Schoeni, R. F.},
title= {Recent trends in disability and functioning among older adults in the United States: A systematic review},
year = {2002},
doi = {10.1001/jama.288.24.3137},
journal = {Journal of the American Medical Association},
volume = {288},
pages = {3137--3146},
}