1. A Comparison of Long- and Short-Acting Opioids for the Treatment of Chronic Noncancer Pain: Tailoring Therapy to Meet Patient Needs 
Charles E. Argoff, MD, Daniel I. Silvershein, MD 
Mayo Clinic Proceedings 
Volume 84, Issue 7, Pages (July 2009)
DOI: /
Copyright © 2009 Mayo Foundation for Medical Education and Research Terms and Conditions

2. FIGURE.
The relationship between intensity of pain and quality of sleep. From Curr Med Res Opin,80 with permission.
Mayo Clinic Proceedings  , DOI: ( / )
Copyright © 2009 Mayo Foundation for Medical Education and Research Terms and Conditions