1. Division of EpidemiologyDepartment of Health Sciences ResearchMayo ClinicRochesterMinnesotaUSA
2. Department of NeurologyMayo ClinicRochesterMNUSA
3. Division of Biomedical Statistics and InformaticsDepartment of Health Sciences ResearchMayo ClinicRochesterMinnesotaUSA
4. Lilly Research LaboratoriesEli Lilly and CompanyIndianapolisINUSA
5. Department of RadiologyMayo ClinicRochesterMNUSA
6. Department of Psychiatry and PsychologyMayo ClinicRochesterMNUSA