Emergency services. Patients' ethnic backgrounds affect utilization.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000368:Aged; D003710:Demography; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005006:Ethnicity; D005260:Female; D006801:Humans; D007585:Jews; D008297:Male; D008396:Maryland; D008875:Middle Aged; D012959:Socioeconomic Factors