1. Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA
2. Cochlear Center for Hearing and Public Health Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA
3. Department of Biostatistics University of North Carolina Chapel Hill North Carolina USA
4. Stroke Branch, National Institute of Neurological Disorders and Stroke Intramural Research Program Bethesda Maryland USA
5. Department of Neurology Mayo Clinic Rochester Minnesota USA
6. Minnesota Population Center University of Minnesota Minneapolis Minnesota USA
7. Division of Epidemiology and Community Health University of Minnesota Minneapolis Minnesota USA
8. Departments of Medicine and Epidemiology Columbia University Irving Medical Center New York New York USA
9. Department of Medicine University of Mississippi Medical Center Jackson Mississippi USA