Mohammad Hosseininejad, Seyed, et al. “The Effect of Intravenous Metoclopramide on Pain, Nausea, Discomfort, and Ease of Insertion of Nasogastric Tube in Emergency Department: A Double-Blind Randomized Clinical Trial”. Sudan Journal of Medical Sciences, vol. 16, no. 4, Dec. 2021, pp. 499-08, doi:10.18502/sjms.v16i4.9947.