Nazemroaya, B., and H. Poudeh. “Comparison of the Effect of Lidocaine and Its Combination With Melatonin and the Valsalva Maneuver on Etomidate Induced Injection Pain”. Anaesthesia, Pain & Intensive Care, Vol. 28, no. 5, Aug. 2024, pp. 842-9, doi:10.35975/apic.v28i5.2279.