1. Department of General Surgery, University of Vienna, Vienna, Austria
2. Department of Internal Medicine I/Oncology, University of Vienna, Austria
3. Department of Internal Medicine III, KA Rudolfstiftung, Austria
4. Department of Radiotherapy, University of Vienna, Austria
5. Department of Pathology, KA Rudolfstiftung, Austria
6. First Department of General Surgery and Ludwig Boltzmann Institute for Laser and Endocrine Surgery, KA Rudolfstiftung, Austria