1. Department of Medical Oncology, University Medical Center Utrecht Universiteitsweg 100, STR 2.129 3584 CG Utrecht The Netherlands
2. Department of Molecular Cancer Research, University Medical Center Utrecht Universiteitsweg 100, STR 2.129 3584 CG Utrecht The Netherlands
3. Institute of Biochemistry, Department of Biology, Swiss Federal Institute of Technology Zürich (ETHZ) HPM D11.3, Schafmattstrasse 18 8093 Zürich Switzerland
4. Division of Cell Biology, Netherlands Cancer Institute Plesmanlaan 121 1066 CX Amsterdam The Netherlands