1. Section for Cell Biology and Physiology; Department of Biology; University of Copenhagen; Copenhagen Denmark
2. Max Planck Institute of Experimental Medicine; Göttingen Germany
3. Institute for Diagnostic and Interventional Radiology; University Medical Center; Göttingen Germany
4. Department of Hematology and Medical Oncology; University Medical Center; Göttingen Germany
5. Institute of Physiology II; University of Münster; Münster Germany