@inbook{1108591561, author={Raymond S. Greenberg}, title={Epidemiologic Measures}, booktitle={Medical Epidemiology: Population Health and Effective Health Care, 5e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2015}, url={accessbiomedicalscience.mhmedical.com/content.aspx?aid=1108591561} }