in the absence of obstruction , mean antibiotic levels in bile from gall bladder and common duct in patients undergoing cholecystectomy were highest for cefazolin ( 17 and 31 mug/ml , respectively ) than either cephaloridine ( 7 and 9 mug/ml ) or cephalothin ( 1 and 4 mug/ml ) .
C0016976
gall bladder
C0008320
cholecystectomy