Jessica A Panzer1, Russell C Dale2. 1. From the Division of Neurology (J.A.P.), Children's Hospital of Philadelphia; the University of Pennsylvania Perelman School of Medicine (J.A.P.), Hospital of the University of Pennsylvania, Philadelphia; and the Neuroimmunology Group (R.C.D.), the Children's Hospital at Westmead, University of Sydney, Australia. panzer@email.chop.edu. 2. From the Division of Neurology (J.A.P.), Children's Hospital of Philadelphia; the University of Pennsylvania Perelman School of Medicine (J.A.P.), Hospital of the University of Pennsylvania, Philadelphia; and the Neuroimmunology Group (R.C.D.), the Children's Hospital at Westmead, University of Sydney, Australia.