1. Department of Pediatric Neurology, Oregon Health & Science University, Portland (J.L.W.).
2. Department of Pediatric Neurology, Providence Health and Services, Portland, OR (A.C.).
3. Department of Vascular Neurology, Cedars Sinai Medical Center, Los Angeles, CA (A.N.S.).
4. Department of Neurology, University of Florida College of Medicine, Gainesville (A.N.S.).