Alimetary disease. Oesophagus, stomach, and small intestines _ medical.
D004194:Disease; D004935:Esophageal Diseases; D004947:Esophagus; D006801:Humans; D007410:Intestinal Diseases; D007421:Intestine, Small; D007422:Intestines; D012907:Smoking; D013270:Stomach; D013272:Stomach Diseases
ESOPHAGUS/diseases; INTESTINE, SMALL/diseases; SMOKING; STOMACH/diseases