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Percentage of Participants Enrolled in Additional Studies by African American Race Versus non-African American Race, 2005–2009
| Study | African American | Non-African American |
| Lumbar puncture | 39% | 66% |
| Pittsburgh Compound-B | 43% | 55% |
| Genetics | 95% | 99.8% |
| Magnetic resonance imaging | 52% | 73% |
