@inbook{1184194809,
author={Justin B. Dimick and Andrew M. Ryan},
editor={Livingston, Edward H. and Lewis, Roger J.},
title={Methods for Evaluating Changes in Health Care Policy—The Difference-in-Differences Approach},
booktitle={JAMA Guide to Statistics and Methods},
publisher={McGraw-Hill Education},
address={New York, NY},
year={2019},
url={jamaevidence.mhmedical.com/content.aspx?aid=1184194809}
}