BibTex format
@article{Griffin:2006:aje/kwj083,
author = {Griffin, JT and Fraser, C and Gras, L and de, Wolf F and Ghani, AC},
doi = {aje/kwj083},
journal = {AMERICAN JOURNAL OF EPIDEMIOLOGY},
pages = {676--683},
title = {The effect on treatment comparisons of different measurement frequencies in human immunodeficiency virus observational databases},
url = {http://dx.doi.org/10.1093/aje/kwj083},
volume = {163},
year = {2006}
}