Repeatability of gastric volume measurements and intragastric content using ultrasound in preterm infants Author(s): Perrella, S.L.; Hepworth, A.R.; Simmer, K.N.; Hartmann, P.E. and Geddes, D.T. Journal: Journal of Pediatric Gastroenterology and NutritionVolume: 59(2)Page: 254-263Year: 2014