1 Dept. Pediatrics and Adolescent Medicine, Div. Pediatric Neurology, University Medical Center Göttingen, Georg-August-Universität Göttingen, Göttingen, Germany. Electronic address: gaertnj@med.uni-goettingen.de.
2 Dept. Pediatrics and Adolescent Medicine, Div. Pediatric Neurology, University Medical Center Göttingen, Georg-August-Universität Göttingen, Göttingen, Germany.