the ion pair extraction technique with azure a solution , chloroform/methanol ( equal volumes ) , and dilute sulfuric acid , was used to study bile-rich duodenal aspirates of ( a ) healthy volunteers and patients with ( b ) cholestatic liver disease , ( c ) crohn 's disease with small bowel involvement , and ( d ) those with primarily colon involvement .
C0013303
duodenal
C0021852
small bowel