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2. Youth risk behavior surveillance—United States, 2003;MMWR,2004
3. Awareness of stroke warning signs—17 states and the U.S. Virgin Islands, 2001;US Centers for Disease Control and Prevention;MMWR,2004
4. The value and hazards of standardization in clinical epidemiologic research;Chan;J Clin Epidemiol,1988
5. Symptoms, signs, and ill-defined conditions: a leading cause of death among minorities;Becker;Am J Epidemiol,1990