1. Department of SurgeryUniversity Medical Center Mannheim, University of HeidelbergMannheim Germany
2. Department of Visceral SurgeryUniversity Hospital, Technical University DresdenDresden Germany
3. Department of Biometry and StatisticsUniversity Medical Center Mannheim, University of HeidelbergMannheim Germany
4. Library, University Medical Center Mannheim, University of HeidelbergMannheim Germany
5. Department of Surgery, Melanoma, Soft Tissues, Head and Neck, Skin CancersNational Cancer Institute of NaplesNaples Italy
6. Division of Surgical Oncology and Thoracic SurgeryMannheim University Medical CenterMannheim Germany
7. Department of General, Vascular and Thoracic SurgeryRoMed Hospital RosenheimRosenheim Germany