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A 10-year-old boy presents with a chief complaint of "stomach pain," which he describes as dull and achy and is associated with nausea and usually vomiting. He denies diarrhea, belching, and sour brash. Between bouts, he has a normal appetite. Results of an extensive GI workup are normal. The family history is insignificant except that his mother reports that she has severe "menstrual headaches."