1. Department of Hematology and Medical Oncology; University Medical Center; 37075 Goettingen Germany
2. Department of Tumor Biology; University Medical Center Hamburg-Eppendorf; 20246 Hamburg Germany
3. Department of General; Visceral and Pediatric Surgery; University Medical Center; 37075 Goettingen Germany
4. Max-Planck Institute for Experimental Medicine; Molecular Biology of Neuronal Signals; 37075 Goettingen Germany
5. Department of Diagnostic and Interventional Radiology; University Medical Center; 37075 Goettingen Germany