Long-term results of salvage endoscopic mucosal resection in patients with local failure after definitive chemoradiotherapy for esophageal squamous cell carcinoma - Yano, T.; Muto, M.; Hattori, S.; Minashi, K.; Onozawa, M.; Nihei, K.; Ishikura, S.; Ohtsu, A.; Yoshida, S. (Endoscopy, 2008)