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[53]Lee KJ, Chung MJ, Park JY, et al. Clinical advantages of a metal stent with an S-shaped anti-reflux valve in malignant biliary obstruction. Dig Endosc. 2013 May;25(3):308-12.
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[54]Lin H, Li S, Liu X. The safety and efficacy of nasobiliary drainage versus biliary stenting in malignant biliary obstruction: a systematic review and meta-analysis. Medicine (Baltimore). 2016 Nov;95(46):e5253.
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