BibTex format
@article{Filippidis:2016:10.1016/j.ypmed.2016.03.004,
author = {Filippidis, FT and Laverty, AA},
doi = {10.1016/j.ypmed.2016.03.004},
journal = {Preventive Medicine},
pages = {136--140},
title = {Perceptions of opportunities for physical activity in 28 European countries.},
url = {http://dx.doi.org/10.1016/j.ypmed.2016.03.004},
volume = {86},
year = {2016}
}