@article{doi:10.1001/jama.2010.1727,
author = {Turakhia MP and Heidenreich PA},
title = {USing restriction to minimize bias in observational studies},
journal = {JAMA},
volume = {304},
number = {21},
pages = {2359-2360},
year = {2010},
doi = {10.1001/jama.2010.1727},
URL = { + http://dx.doi.org/10.1001/jama.2010.1727},
eprint = {/data/Journals/JAMA/4539/jlt1201_2359_2359.pdf}
}