Recommendations for Urine Drug Monitoring as a Component of Opioid Therapy in the Treatment of Chronic Pain. - Peppin, John F.; Passik, Steven D.; Couto, Joseph E.; Fine, Perry G.; Christo, Paul J.; Argoff, Charles; Aronoff, Gerald M.; Bennett, Daniel; Cheatle, Martin D.; Slevin, Kieran A.; Goldfarb, Neil I. (Pain Medicine, 2012)