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Botulinum toxin A injection using ultrasound combined with balloon guidance for the treatment of cricopharyngeal dysphagia: analysis of 21 cases.
[BACKGROUND] As an upper oesophageal sphincter (UES) dysfunction disorder, cricopharyngeal achalasia (CPA) is a common cause of dysphagia and is associated with an increased risk of pulmonary complications. The aim of this study was to inve…