@article{Singh2014,
author = {Singh, G.K. and Siahpush, M.},
title= {Widening rural–urban disparities in life expectancy, U.S., 1969–2009},
year = {2014},
doi = {10.1016/j.amepre.2013.10.017},
volume = {46},
number = {2},
pages = {e19--e29},
}