1. Department of General and Visceral Surgery, University Hospital Goettingen, Goettingen, Germany
2. Department of Radiotherapy, University Hospital Goettingen, Goettingen, Germany
3. Department of Radiology, University Hospital Goettingen, Goettingen, Germany
4. Department of Laboratory Animal Science, University Hospital Goettingen, Goettingen, Germany
5. Department of Genetic Epidemiology, University Hospital Goettingen, Goettingen, Germany