BibTex format
@article{Greenfield:2016:10.1136/bmj.i4803,
author = {Greenfield, G and Foley, K and Majeed, A},
doi = {10.1136/bmj.i4803},
journal = {BMJ},
title = {Rethinking primary care's gatekeeper role.},
url = {http://dx.doi.org/10.1136/bmj.i4803},
volume = {354},
year = {2016}
}