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Meta-analysis of incidence of dysphagia. The interventions included radiotherapy plus chemotherapy (Herskovich 1992), radiotherapy plus chemotherapy plus surgery (Algan 1995), and radiotherapy plus chemotherapy plus surgery plus induction chemotherapy (Yoon 2015). The control groups were radiotherapy alone (Herskovich 1992), radiotherapy plus chemotherapy (Algan 1995), or radiotherapy plus chemotherapy plus surgery (Yoon 2015).
