BibTex format
@article{Filippidis:2016:10.1136/bmjopen-2016-012084,
author = {Filippidis, FT and Laverty, AA and Vardavas, CI},
doi = {10.1136/bmjopen-2016-012084},
journal = {BMJ Open},
title = {Experimentation with e-cigarettes as a smoking cessation aid: a cross-sectional study in 28 European Union member states},
url = {http://dx.doi.org/10.1136/bmjopen-2016-012084},
volume = {6},
year = {2016}
}