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Geospatial distribution of HNC cases (per 10,000 people) in Alabama counties by age group, using age-adjusted reference population data from U.S. Census 2010; (A) HNC cases per 10,000 people in the young group (diagnosis age ≤45 years) and (B) HNC cases per 10,000 people in the old group (diagnosis age >45 years). Rural and urban counties are defined based on 2010 U.S. Census Bureau's rurality classification. HNC, head and neck cancer.
