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Flowchart of patient enrollment for analysis. ∗Additional chemoradiation therapy for poor histological features, such as lymphovascular invasion or postablation histology revealed invasive cancer to the muscularis mucosa layer. APC = Argon plasma coagulation, CR = complete remission, ESCNs = esophageal squamous cell neoplasias, F-RFA = focal-type (HALO90) radiofrequency ablation, HGD = high grade dysplasia.
