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Palliative drainage is the primary treatment option for unresectable malignant hilar biliary obstruction (UMHBO) to improve the prognosis and quality of life. Currently, endoscopic biliary drainage is considered as a first-line treatment for UMHBO as well as for distal biliary obstruction. Self-expanding metal stents (SEMSs) are preferred over plastic stents (PSs) in patients with life expectancy...
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