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Fine PG, Portenoy RK; Ad Hoc Expert Panel on Evidence Review and Guidelines for Opioid Rotation.Fine PG, et al.J Pain Symptom Manage. 2009 Sep;38(3):418-25. doi: 10.1016/j.jpainsymman.2009.06.002.J Pain Symptom Manage. 2009.PMID: 19735902Free PMC article.