1 Pediatrics and Neurology Rainbow Babies and Children's Hospital-MacDonald Hospital for Women, Case Western Reserve University, USA; Department of Neurology, Children's Hospital of Philadelphia, University of Pennsylvania, USA. Electronic address: mark.s.scher@gmail.com.
2 Department of Neurology, Children's Hospital of Philadelphia, University of Pennsylvania, USA.
3 Department of Neurology, Children's Hospital of Philadelphia, University of Pennsylvania, USA; Cincinnati Children's Hospital, University of Cincinnati, USA.