title: Gastrointestinal tract.
authors.forename: C K
authors.initials: CK
authors.lastname: Hayden
mesh_terms: D003937:Diagnosis, Differential; D005767:Gastrointestinal Diseases / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D014463:Ultrasonography / Q000379:methods*; D014839:Vomiting / Q000175:diagnosis* / Q000209:etiology