Additional thoughts about racial differences in the prevalence of headaches in US adolescents.
Rhee
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D000293:Adolescent; D005006:Ethnicity / Q000706:statistics & numerical data*; D006261:Headache / Q000453:epidemiology* / Q000235:genetics*; D006801:Humans; D015995:Prevalence; D044469:Racial Groups; D012008:Recurrence; D012107:Research Design; D014481:United States / Q000453:epidemiology