BibTex format
@article{Honeyford:2014:10.1136/bmjopen-2014-005217,
author = {Honeyford, K and Baker, R and Bankart, MJG and Jones, DR},
doi = {10.1136/bmjopen-2014-005217},
journal = {BMJ Open},
title = {Estimating smoking prevalence in general practice using data from the Quality and Outcomes Framework (QOF)},
url = {http://dx.doi.org/10.1136/bmjopen-2014-005217},
volume = {4},
year = {2014}
}