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8Frimberger. Expanding spiral: a new type of prosthesis for the palliative treatment of malignant esophageal stenosis [J]. Endoscopy, 1983, 15: 213~214.
9Siersema PD, Marcon N, Vakil N. Metal stents for tumors of the distal esophagus and gastric cardia [J]. Endoscopy, 2003, 35:79~85.
10Acunas B, Poyanli A, Rozanes I. Intervention in gastrointestinal tract: the treatment of esophageal, gastroduodenal and colorectal obstructions with metallic stents[J]. Eur J Radiol, 2002, 42:240~248.