Eisenberg, MD, E., D. Cohen, MA, E. Lawental, PhD, and D. Pud, PhD. “Personality Traits and Sensitivity to Pain in Male Chronic Opioid Addicts”. Journal of Opioid Management, vol. 3, no. 4, July 2007, pp. 225-30, doi:10.5055/jom.2007.0008.