The stomach and duodenum.
Op den Orth
J O
JO
St. Elisabeth's of Groote Gasthuis, Haarlem, The Netherlands.
D004378:Duodenal Diseases / Q000175:diagnosis; D004386:Duodenum / Q000473:pathology*; D006801:Humans; D013270:Stomach / Q000473:pathology*; D013272:Stomach Diseases / Q000175:diagnosis; D014463:Ultrasonography