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  • We asked participants about experience of heartburn (“a burning pain or discomfort behind the breastbone in your chest”) or acid regurgitation (“a bitter or sour-tasting fluid coming up into your throat or mouth”); positive responses to these initial screening questions elicited further questions about age at onset of symptoms and frequency of symptoms at ages 10–19, 20–29, 30–49, and 50–79 years, as applicable, on a five-point ordinal scale [4].
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