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How many biopsies should be performed during percutaneous transhepatic cholangioscopy to diagnose biliary tract cancer?

Surgical OncologyHepatologyPercutaneous Transhepatic CholangioscopyBiliary TractMedicineHepatobiliary TumorSurgical PathologyHistopathologyGastroenterologyDiagnosisBiliary Tract CancerMany BiopsiesBiliary CancerBiliary DisorderSurgeryBiliary CancersOncologyRadiology