1. ; Department of Pediatrics; University of Hamburg; Germany
2. ; Department of Pediatrics; University of Münster; Germany
3. ; Institute of Physiology; University of Münster; Germany
4. ; Department of Pediatrics; University of Copenhagen; Denmark
5. ; Department of Clinical Chemistry; Free University of Amsterdam; The Netherlands
6. ; Department of Neurology; University of Ulm; Germany
7. ; Department of Molecular Neurobiology; University of Hamburg; Germany