Mahendra, A. C.; Thamrin, M. H.; Putro, B. N.; Dzikri, D. N. Differences in Pain Visual Analog Scale and High-Sensitivity C-Reactive Protein Levels After Perioperative Fentanyl and Ketamine Administration in Post-Laparotomy Patients: A Double-Blind Randomized Controlled Trial: Research. Cermin Dunia Kedokteran 2026, 53, 508-513.