1. Children's Hospital of Augsburg; Augsburg Germany
2. Department of Neuropathology; University of Bonn; Bonn Germany
3. Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI); University of Mainz; Mainz Germany
4. Institute of Biostatistics and Clinical Research; University of Muenster; Muenster Germany
5. Department of Neuroradiology; University of Wuerzburg; Wuerzburg Germany