R, M. F., M. W. Harahap, and H. Baderu. “Systematic Review: The Effect of Preemptive Ketamine Administration on Post-Surgical Neutrophil to Lymphocyte Ratio And Interleukin-6 (Il-6) Levels”. Journal La Medihealtico, Vol. 7, no. 4, Sept. 2026, pp. 936-54, doi:10.37899/journallamedihealtico.v7i4.5985.