@article{ref1,
title="Letter: Imprecise incidents of incidence",
journal="JAMA journal of the American Medical Association",
year="1974",
author="Schoenberg, B. S.",
volume="229",
number="13",
pages="1724-1724",
abstract="Abstract unavailable.",
language="",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}