1. Division of Pediatric Neurology, Department of Neurology Washington University School of Medicine St. Louis Missouri USA
2. Division of Neurology, Nationwide Children's Hospital Ohio State University Columbus Ohio USA
3. Division of Child Neurology, Department of Pediatrics Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
4. Department of Neurology, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
5. The Cerebral Palsy Research Network Salt Lake City Utah USA