1. Max Delbrueck Center for Molecular Medicine, D-13092 Berlin
2. Department of Surgery and Surgical Oncology, Robert-Roessle-Klinik, D-13122 Berlin
3. Nikolaus-Fiebiger-Zentrum, University of Erlangen, D-91054 Erlangen
4. Department of Neuropathology, University of Bonn Medical Center, D-53105 Bonn, Germany
5. Department of Immunology, University Hospital Utrecht, NL-3584 CX Utrecht, The Netherlands