1. ; Department of Pediatric Neurology; University of Essen; Essen
2. ; Department of Pediatric Neurology; University of Essen; Hufelandstraße 55 Essen D-45122 Germany
3. Department of Pediatrics; Bethanien-Krankenhaus; Moers
4. Kinderzentrum Gliead; Bielefeld
5. Department of Pediatrics; Wedau-Kliniken; Duisburg Germany