BibTex format
@inproceedings{Cai:2013,
author = {Cai, Y and Schikowski, T and Carsin, A-E and et, al},
publisher = {Environ Health Perspect},
title = {Effect of air pollution on prevalence of chronic bronchitis symptoms-a cross-sectional analysis of 5 cohort studies},
url = {http://ehp.niehs.nih.gov/ehbasel13/p-1-05-13/},
year = {2013}
}