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Full Opioid Agonists and Tramadol: Pharmacological and Clinical Considerations. 

Edinoff AN, Kaplan LA, Khan S, Petersen M, Sauce E, Causey CD, Cornett EM, Imani F, Moradi Moghadam O, Kaye AM, Kaye AD. 

Anesth Pain Med. 2021 Sep 6;11(4):e119156. doi: 10.5812/aapm.119156. PMID: 34692448; PMCID: PMC8520671.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8520671/