@inbook{1183878502,
author={Edward J. Mills and David Gardner and Kristian Thorlund and Matthias Briel and Heiner C. Bucher and Stirling Bryan and Brian Hutton and Gordon Guyatt},
editor={Guyatt, Gordon and Rennie, Drummond and Meade, Maureen O. and Cook, Deborah J.},
title={Understanding Class Effects},
booktitle={Users' Guides to the Medical Literature: A Manual for Evidence-Based Clinical Practice, 3rd ed},
publisher={McGraw-Hill Education},
address={New York, NY},
year={2015},
url={jamaevidence.mhmedical.com/content.aspx?aid=1183878502}
}