8. South SM, Smith MT. Analgesic tolerance to opioids. Pain Clinical Updates. December 2001:1-4.
9. Manniche, C., Lundberg, E., Christensen, I., Bentzen, L., & Hesselsà ¸e, G. Intensive dynamic back exercises for chronic low back pain: a clinical trial. Pain, Volume 47, Issue 1, October 1991,
10. Mao J, Price DD, Mayer DJ. Mechanisms of hyperalgesia and opiate tolerance: a current view of their possible interactions. Pain 1995;62:259-74.
11. Mao J, Price DD, Mayer DJ. Thermal hyperalgesia in association with the development of morphine tolerance in rats: roles of excitatory amino acid receptors and protein kinase C. J Neurosci 1994;14:2301-12.
12. Brodner RA, Taub A. Chronic pain exacerbated by long-term narcotic use in patients with
non-malignant disease: clinical syndrome and treatment. Mt Sinai J Med 1978;45:233-7.
13. Taylor CB, Zlutnick SI, Corley MJ, Flora J. The effects of detoxification, relaxation, and brief
supportive therapy on chronic pain. Pain 1980;8:319-29.
14. Savage SR. Long-term opioid therapy: assessment of consequences and risks. J Pain Symptom Manage 1996;11:274-86.