@article{Crimmins1993,
author = {Crimmins, E.M. and Saito, Y.},
title= {Getting better and getting worse: Transitions in functional status among older Americans},
year = {1993},
doi = {10.1177/089826439300500101},
journal = {Journal of Aging and Health},
volume = {5},
number = {1},
pages = {3‒36},
}