1. Department of Neurology; Penn State Milton S. Hershey Medical Center; Hershey Pennsylvania USA
2. Divisions of Epidemiology and Community Health; School of Public Health, University of Minnesota; Minneapolis Minnesota USA
3. Westat Inc.; Durham North Carolina USA
4. Biostatistics Branch; National Institute of Environmental Health Sciences, Research Triangle Park; North Carolina USA
5. Section of Atherosclerosis and Vascular Medicine; Department of Medicine; Baylor College of Medicine, and Center for Cardiovascular Disease Prevention, Methodist DeBakey Heart Center; Houston Texas USA
6. Departments of Pharmacology and Neurology; Penn State University College of Medicine; Hershey Pennsylvania USA
7. Department of Medicine (Geriatrics); University of Mississippi Medical Center; Jackson Mississippi USA
8. Epidemiology Branch; National Institute of Environmental Health Sciences, Research Triangle Park; North Carolina USA