1 Department of Neurology, Seattle Children's Hospital, Seattle, Washington. Electronic address: calefond@seattlechildrens.org.
2 Department of Neurology, Boston Children's Hospital, Boston, Massachusetts; Department of Psychiatry, Boston Children's Hospital, Boston, Massachusetts; Department of Radiology, Boston Children's Hospital, Boston, Massachusetts.
3 Department of Neurology, Cleveland Clinic, Cleveland, Ohio.
4 Department of Neurology, Children's Hospital Colorado, Aurora, Colorado.
5 Department of Neurology, Children's Medical Center at Dallas, Dallas, Texas.
6 Department of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada.