Anil Kumar, Syed Farjad Sultan, Mehar Ali. “Gastric Fluid Volume in Patients Fasting for Clear Fluid Ingestion from Midnight Versus 2 Hours Prior Laparoscopic Cholecystectomy”. Pakistan Journal of Medical & Health Sciences, vol. 16, no. 05, June 2022, p. 312, doi:10.53350/pjmhs22165312.