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Please answer the following: A doctor wants to determine how diet affects the development of stomach ulcers. He has a sample of his patients, who

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A doctor wants to determine how diet affects the development of stomach ulcers. He has a sample of his patients, who have just been diagnosed with ulcers, fill out a questionnaire about the foods they ate over the past year. Is this a longitudinal or cross-sectional study? Explain your choice. (2 marks)

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