@article{Smith2013,
author = {Smith, A.K. and Walter, L.C. and Miao, Y. and Boscardin, W.J. and Covinsky, K.E. },
title= {Disability during the last two years of life},
year = {2013},
doi = {10.1001/jamainternmed.2013.8738},
journal = {JAMA Internal Medicine },
volume = {173},
number = {16},
pages = {1506--1513},
}