title: Comparison of barium swallow and ultrasound in diagnosis of gastro-oesophageal reflux.
mesh_terms: D002648:Child; D002675:Child, Preschool; D005764:Gastroesophageal Reflux / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D007223:Infant; D011859:Radiography; D014463:Ultrasonography