1. Department of Epidemiology; Richard M. Fairbanks School of Public Health; Indiana University-Purdue University Indianapolis; Indianapolis Indiana
2. Division of Vascular Surgery and Endovascular Therapy; University of Alabama at Birmingham; Birmingham Alabama
3. Department of Neurology; School of Medicine; University of Alabama at Birmingham; Birmingham Alabama
4. Department of Biostatistics; School of Public Health; University of Alabama at Birmingham; Birmingham Alabama