1. C. Cui, L. Kuller, and A. Sekikawa are with the Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
2. R. Birru is with the Department of Environmental and Occupational Health, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
3. B. Snitz and O. Lopez are with the Department of Neurology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
4. M. Ihara, A. Higashiyama, C. Kakuta, and Y. Miyamoto are with the National Cerebral and Cardiovascular Center, Osaka, Japan
5. B. Lopresti and C. Mathis are with the Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
6. H. Aizenstein is with the Department of Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania, USA