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Impact of the presence of a common channel or amylase in the aspirate from the common bile duct on recommendation for resection Percentage of responses recommending resection in the presence or absence of a common channel or amylase level above 8000 units/l, stratified by patient age and common bile duct (CBD) dilatation: a CBD 13 mm (case A), b CBD 20 mm (case B), c CBD 26 mm (case C). *P < 0·050 (χ2 test).
