@inbook{1184194265, author={William J. Meurer and Roger J. Lewis}, editor={Livingston, Edward H. and Lewis, Roger J.}, title={Cluster Randomized Trials: Evaluating Treatments Applied to Groups}, booktitle={JAMA Guide to Statistics and Methods}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={jamaevidence.mhmedical.com/content.aspx?aid=1184194265} }