A 68-year-old woman complains of recurring mid-abdominal pain 1 to 2 hours postprandially. She has lost weight because of fear of pain when she eats. At the time that you see the patient, she is a thin, elderly female in no acute distress. Examination of her abdomen is unremarkable, and a stool for occult blood is negative.

The test most likely to explain the reason for the patient's symptoms is:

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