title: Bowel transit studies in the elderly: radio-opaque markers in the investigation of constipation.
mesh_terms: D000368:Aged; D001466:Barium Sulfate; D003248:Constipation / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D011859:Radiography; D013997:Time Factors
chemical_list: D001466:Barium Sulfate