1. Division of Epidemiology, Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota2Department of Neurology, Mayo Clinic, Rochester, Minnesota
2. Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota
3. Division of Epidemiology, Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota
4. Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
5. Department of Neurology, Mayo Clinic, Rochester, Minnesota
6. Department of Psychiatry and Psychology, Mayo Clinic, Rochester, Minnesota
7. Department of Radiology, Mayo Clinic, Rochester, Minnesota