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The number of heartburn-related queries per year in millions and the number of queries per 1000 Google-user years in each country. AU—Australia, CA—Canada, DE—Germany, PL—Poland, UK—the United Kingdom, US—the United States; rounds sizes are proportional to the number of heartburn-related queries per year. The color corresponds to the number of queries per 1000 Google-users years (darker color—higher number).
