1. Centre for Cancer Biomedicine and Department of Biochemistry, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, N-0310, Oslo, Norway
2. Department of Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605
3. Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø, 9037 Tromsø, Norway
4. Department of Technology, Sør-Trøndelag University College, 7004 Trondheim, Norway