1. Division of Cardiology; University of Minnesota; Minneapolis MN USA
2. Division of Epidemiology and Community Health, School of Public Health; University of Minnesota; Minneapolis MN USA
3. Department of Neurology; Johns Hopkins University School of Medicine; Baltimore MD USA
4. Cardiovascular Division; Brigham and Women's Hospital; Boston MA USA
5. Division of Epidemiology and School of Public Health; Emory University; Atlanta GA USA