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Large-diameter self-expandable metallic stent for achalasia. A: Self-expandable metal stents similar to that used by Coppola et al[43]. Picture is provided by courtesy of Mr. Kuhn D, Micro-Tech Europe GmbH, Dusseldorf, Germany; B: Niti-S stent. Picture is provided by courtesy of Mr. Bekzat M, TaeWoong Medical, Seoul, South Korea.
