@article{Choi2016,
author = {Choi, H. and Schoeni, R.F. and Martin, L.G.},
title= {Are functional and activity limitations becoming more prevalent among 55 to 69-year-olds in the United States?},
year = {2016},
doi = {10.1371/journal.pone.0164565},
volume = {11},
number = {10},
pages = {0164565},
}