1. Pain Management, Controlled Substances, and State Medical Board Policy
David E Joranson, MSSW, Aaron M Gilson, PhD, June L Dahl, PhD, J.David Haddox, DDS, MD 
Journal of Pain and Symptom Management 
Volume 23, Issue 2, Pages (February 2002)
DOI: /S (01)

2. Fig. 1
The cumulative trend in the number of pain management or controlled substances policies adopted by state medical boards in the United States from 1989 to 2000.
Journal of Pain and Symptom Management  , DOI: ( /S (01) )