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- [25] Comparison of effect of Various Combinations of four drugs i.e IV Ondansetron, Ranitidine, Metoclopramide and Omeprazole, to reduce Gastric Fluid Residual Volume and Gastric Acidity in Elective Laparoscopic-Cholecystectomy patients PAKISTAN JOURNAL OF MEDICAL & HEALTH SCIENCES, 2021, 15 (07): : 1760 - 1763