1. The Department of Neurology, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
2. The College of Nursing, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
3. The Department of Neurology, Oregon Health and Science University, Portland, Oregon.
4. The Department of Internal Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
5. Departments of Medicine and Veterans Affairs Medical Center, Denver, Colorado.
6. The Division of Neurology, University of Alberta, Edmonton, Alberta.