title: Comparison of barium swallow and ultrasound in diagnosis of gastro-oesophageal reflux in children.
mesh_terms: D001466:Barium Sulfate; D002648:Child; D005764:Gastroesophageal Reflux / Q000175:diagnosis*; D006551:Hernia, Hiatal / Q000175:diagnosis; D006801:Humans; D007223:Infant; D014463:Ultrasonography
chemical_list: D001466:Barium Sulfate