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6 - Conio M, Repici A, Battaglia G, De Pretis G, Ghezzo L, Bittinger M, et al. A randomized prospective comparison of self-expandable plastic stents and partially covered self-expandable metal stents in the palliation of malignant esophageal dysphagia. American Journal of Gastroenterology. 2007;102(12):2667-77.