A 63-year-old man presents to the office with a 2-year history of episodic swallowing problems that have been increasing in frequency. He states that food seems to stick in his throat, and these episodes are often associated with coughing or regurgitating undigested food. Physical examination reveals that the patient has halitosis; otherwise, findings are normal. Which one of the following is the best next step to confirm the most likely diagnosis?
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