“The effectiveness of intranasal fentanyl and intravenous ketorolac tromethamine combination for postoperative analgesia ” (2021) Annals of Medical Research, 4(3), pp. 0279–0281. Available at: http://www.annalsmedres.org/index.php/aomr/article/view/2624 (Accessed: 11 May 2025).