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Tags: 2012, Acute Pain/blood/physiopathology, Adult, Analgesia/methods, Backlog, beta-Endorphin/blood, Biomarkers of Pain, Bruehl S, Burns JW, Chont M, Chronic Pain/blood/physiopathology, Chung OY, Cross-Over Studies, Double-Blind Method, European Journal Of Pain, Female, Humans, Journal Article, Low Back Pain/blood/physiopathology, Male, Middle Aged, Naloxone/pharmacology, Narcotic Antagonists/pharmacology, Pain Measurement/drug effects, Pain Threshold/drug effects/physiology, Physical Stimulation
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