镍钛记忆合金支架治疗21例良恶性气管、支气管狭窄的疗效观察
얼태기억합금지가치료21례량악성기관、지기관협착적료효관찰
The observation of effect of tracheobronchial Ni-Ti alloy self expand stents placement in 21 patients with benign or malignant tracheobronchiai stenosis
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