@article{Yen2009,
author = {Yen, I.H. and Michael, Y.L. and Perdue, L. },
title= {Neighborhood environment in studies of health of older adults: A systematic review},
year = {2009},
doi = {10.1016/j.amepre.2009.06.022},
journal = {American Journal of Preventive Medicine },
volume = {37},
number = {5},
pages = {455--463},
}