@article{Hardy2005,
author = {Hardy, S.E. and Dubin, J.A. and Holford, T.R. and Gill, T.M.},
title= {Transitions between states of disability and independence among older persons},
year = {2005},
doi = {10.1093/aje/kwi083},
journal = {American Journal of Epidemiology},
volume = {161},
number = {6},
pages = {575--584},
}