1. Department of Surgery, Medical University of Vienna – General Hospital, Vienna, Austria
2. Department of Surgery, Hospital Elisabethinen, Linz, Austria
3. Department of Surgery, University Hospital St Pölten, St Pölten, Austria
4. Department of Surgery, State Hospital Wiener Neustadt, Wiener Neustadt, Austria
5. Department of Surgery, Medical University of Innsbruck, Innsbruck, Austria
6. Department of Surgery, District Hospital Dornbirn, Dornbirn, Austria
7. Department of Surgery, Medical University of Salzburg, Salzburg, Austria
8. Department of Surgery, Medical University of Graz, Graz, Austria
9. Department of Statistics, Austrian Breast and Colorectal Cancer Study Group, Vienna, Austria