1. Institute of Neuropathology, RWTH Aachen University Medical School, Pauwelsstr. 30; 52074 Aachen Germany
2. Department of Neurosurgery; RWTH Aachen University Medical School, Pauwelsstr. 30; 52074 Aachen Germany
3. Department of Neurology; Ulm University, Helmholtzstr 8/2; Ulm 89081 Germany
4. Institute of Clinical Neurobiology, University of Würzburg, Versbacherstr. 5; Würzburg 97078 Germany
5. Columbia University Medical Center, Center for Motor Neuron Biology and Disease, 630 West 168th Street; New York NY 10032
6. Department of Child and Adolescent Psychiatry; University Hospital Würzburg, Füchsleinstr. 15; Würzburg 97080 Germany
7. Institute of Neuroanatomy, RWTH Aachen University Medical School, Pauwelsstr. 30; 52074 Aachen Germany
8. Department of Neurology; District Hospital Siegen; Siegen 57076 Germany
9. Academic Medical Centre, Meibergdreef 9; 1105 AZ Amsterdam The Netherlands