1. Measuring and Explaining Computed Tomography Use in the United States and Canada: A Consideration of Health Economics and Use Versus Appropriateness, and Interpreting Potential Conflict of Interest 
David L. Schriger, MD, MPH, Michael L. Callaham, MD, Tyler W. Barrett, MD, MSCI 
Annals of Emergency Medicine 
Volume 63, Issue 4, Pages (April 2014)
DOI: /j.annemergmed
Copyright © 2014 American College of Emergency Physicians Terms and Conditions

2. Figure
Illustration of relationship between marginal, variable, average, fixed, and total costs.
Annals of Emergency Medicine  , DOI: ( /j.annemergmed )
Copyright © 2014 American College of Emergency Physicians Terms and Conditions