@inbook{1163005732, author={Alex F. Manini}, editor={Nelson, Lewis S. and Howland, Mary Ann and Lewin, Neal A. and Smith, Silas W. and Goldfrank, Lewis R. and Hoffman, Robert S.}, title={Principles of Epidemiology and Research Design}, booktitle={Goldfrank's Toxicologic Emergencies, 11e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={accessemergencymedicine.mhmedical.com/content.aspx?aid=1163005732} }