BibTex format
@article{Ramsay:2003:10.1136/bmj.326.7385.365,
author = {Ramsay, ME and Andrews, NJ and Trotter, CL and Kaczmarski, EB and Miller, E},
doi = {10.1136/bmj.326.7385.365},
journal = {BMJ},
pages = {365--366},
title = {Herd immunity from meningococcal serogroup C conjugate vaccination in England: database analysis.},
url = {http://dx.doi.org/10.1136/bmj.326.7385.365},
volume = {326},
year = {2003}
}