1. Center of Developmental Neurology; Frankfurt Germany
2. Institute of Medical Biometry and Informatics; University of Heidelberg; Heidelberg Germany
3. Neuropediatrics Section; Center for Child and Adolescent Medicine; Heidelberg University Hospital; Heidelberg Germany
4. Institute of Developmental Neurology; Beatrix Children's Hospital; University of Groningen; University Medical Center Groningen; Groningen the Netherlands