2025. Toward Opioid-Free Analgesia: Metamizole–Ketamine versus Metamizole–Tramadol in Orthopedic Postoperative Pain Management. Journal of Carcinogenesis. 24, 7s (Sep. 2025), 747–754. DOI:https://doi.org/10.64149/J.Carcinog.24.7s.747-754.