@article{Saelens2003,
author = {Saelens, B.E. and Sallis, J.F. and Black, J.B. and Chen, D.},
title= {Neighborhood-based differences in physical activity: An environment scale evaluation},
year = {2003},
doi = {10.2105/AJPH.93.9.1552},
journal = {American Journal of Public Health},
volume = {93},
number = {9},
pages = {1552--1558},
}