@inbook{1108591056,
author={David J. Ballard and Briget da Graca and David Nicewander},
editor={Greenberg, Raymond S.},
title={Variations in Care},
booktitle={Medical Epidemiology: Population Health and Effective Health Care, 5e},
publisher={McGraw-Hill Education},
address={New York, NY},
year={2014},
url={accessbiomedicalscience.mhmedical.com/content.aspx?aid=1108591056}
}