Letter to Editor The Dilemma of Opioid-Induced Hyperalgesia and Tolerance in Chronic Opioid Therapy 2013-01-01 Sultan Qaboos University Medical Journal, College of Medicine & Health Sciences oai:europepmc.org:2618557 PMC3616791 oai:europepmc.org:2618557 true true 0.9 dedup The Dilemma of Opioid-Induced Hyperalgesia and Tolerance in Chronic Opioid Therapy 2013-01-01 Sultan Qaboos University Medical Journal, College of Medicine & Health Sciences http://europepmc.org/articles/PMC3616791/