@inbook{1199075137, author={Bijan A. Niknam and Jose R. Zubizarreta}, editor={Livingston, Edward H. and Lewis, Roger J.}, title={Using Cardinality Matching to Design Balanced and Representative Samples for Observational Studies}, booktitle={JAMA Guide to Statistics and Methods}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={jamaevidence.mhmedical.com/content.aspx?aid=1199075137} }