1. Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, 0310 Oslo, Norway.
2. Department of Biochemistry, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, Montebello, 0310 Oslo, Norway.
3. Faculty of Biotechnology, University of Wroclaw, Tamka 2, 50-137 Wroclaw, Poland.
4. Division of Neuroanatomy, Innsbruck Medical University, Muellerstrasse 59, 6020 Innsbruck, Austria.