@article{doi:10.2106/JBJS.H.01577,
author = {Morshed, Saam and TornettaIII, Paul and Bhandari, Mohit},
title = {Analysis of Observational Studies: A Guide to Understanding Statistical Methods},
journal = {The Journal of Bone & Joint Surgery},
volume = {91},
number = {Supplement_3},
pages = {50-60},
year = {2009},
doi = {10.2106/JBJS.H.01577},
URL = { + http://dx.doi.org/10.2106/JBJS.H.01577},
eprint = {}
}