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Manchikanti, L., Vallejo, R., Manchikanti, K.N., Benyamin, R.M., Datta, S. and Christo, P.J. (2011) Effectiveness of Long-Term Opioid Therapy for Chronic Non-Cancer Pain. Pain Physician, 14, E133-E156.
https://www.ncbi.nlm.nih.gov/pubmed/21412378

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