A 42-year-old woman is evaluated for an 8-month history of crampy abdominal pain and three loose bowel movements per day. The pain is relieved by a bowel movement. There are no nocturnal bowel movements, and there is no blood or dark tarry material in the stool. She has not had fever, night sweats, or weight loss. She has a history of Hashimoto disease and is treated with levothyroxine. Following a physical exam, rectal exam, and lab tests, what is the most appropriate next step in management?
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