BibTex format
@article{Williams:2005:10.1136/bmj.330.7496.869,
author = {Williams, S and Bottle, A and Rogers, R and Aylin, P},
doi = {10.1136/bmj.330.7496.869},
journal = {BRITISH MEDICAL JOURNAL},
pages = {869--+},
title = {Dr Foster's case notes - "Frequent flier" patients},
url = {http://dx.doi.org/10.1136/bmj.330.7496.869},
volume = {330},
year = {2005}
}