1. Department of Lab Medicine and PathologySchool of Public Health, University of MinnesotaMinneapolisMNUSA
2. Division of Epidemiology and Community HealthSchool of Public Health, University of MinnesotaMinneapolisMNUSA
3. School of Public Health, University of Texas Health Science CenterHoustonTXUSA
4. Department of NeurologyJohns Hopkins UniversityBaltimoreMDUSA
5. School of Public Health, Johns Hopkins UniversityBaltimoreMDUSA
6. Department of MedicineUniversity of Mississippi Medical CenterJacksonMSUSA
7. Collaborative Studies Coordinating Center, University of North CarolinaChapel HillNCUSA
8. Department of NeurologyMayo ClinicRochesterMNUSA