Health Disparities: Studies that are comparative based on gender, age, race, ethnicity, education, income, social class, disability, geographic location, or sexual orientation are listed as "health disparities" (e.g., a study delineating differences in health care access and utilization for cancer control between rural and urban areas). Medically Underserved Populations: Studies that are not comparative but focused on specific populations based on gender, age, race, ethnicity, education, income, social class, disability, geographic location, or sexual orientation are listed as "medically underserved" (e.g., a study based on cancer care in a low income community). Health Disparities & Medically Underserved Populations : Studies that are both comparative and focused on a medically underserved group are listed as "health disparities and medically underserved" (e.g., a study comparing risk factors and cancer rates in Caribbean and African American populations in the United States).