1. University of Minnesota School of Medicine, Department of Neurology, Minneapolis, Minnesota, USA
2. Wake Forest University School of Medicine, Department of Neurology, Winston-Salem, North Carolina, USA
3. Emory University, Department of Neurology, Atlanta, Georgia, USA
4. University of Virginia, Department of Neurology, Charlottesville, Virginia, USA
5. University of Michigan, Department of Pediatrics, Ann Arbor, Michigan, USA
6. University of Louisville, Department of Neurology, Louisville, Kentucky, USA
7. Medical College of Wisconsin, Department of Neurology, Milwaukee, Wisconsin, USA
8. Beth Israel Deaconess Medical Center, Department of General Medicine, Boston, Massachusetts, USA