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Why is there a question on the follow-up form requesting parents’ places of birth?

April 26, 2017birth follow-up form requesting

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Why is there a question on the follow-up form requesting parents’ places of birth?

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This provides some information on the regional origins of participants in the study, which can sometimes be associated with both diet and health. Allowing for this can help to clarify the role of diet compared to other factors which can affect health.