To evaluate during a 7 months period the efficacy, safety and accuracy of percutaneous transluminal forceps biopsy combined with transhepatic biliary drainage in patients with biliary stricture
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Efficacy of PTBD
Timeframe: 7 days
accuracy for percutaneous biliary biopsy (PTFB)
Timeframe: from baseline up to 1 month
incidence of PTFB-related adverse events
Timeframe: up to 1 month after procedure