1. Department of Thoracic Surgery, West German Cancer Center, Medical Faculty, University Hospital Essen, Ruhrlandklinik, Tueschner Weg 40, 45239 Essen, Germany
2. Department of Medical Oncology, West German Cancer Center, Medical Faculty, University Hospital Essen, Hufelandstr. 55, 45147 Essen, Germany
3. Interdisciplinary GU Oncology, West German Cancer Center Essen, Clinic for Urology and Clinic for Medical Oncology, University Hospital Essen, 45147 Essen, Germany
4. Department of Medical Oncology, Sarcoma Center, West German Cancer Center, Medical Faculty, University Hospital Essen, Hufelandstr. 55, 45147 Essen, Germany
5. Department of Gastroenterology und Hepatology, Medical Faculty, University Hospital Essen, Hufelandstr. 55, 45147 Essen, Germany
6. Department of Otorhinolaryngology, Medical Faculty, University Hospital Essen, Hufelandstr. 55, 45147 Essen, Germany
7. Department of Gynecology and Obstetrics, West-German Cancer Center, Medical Faculty, University Hospital Essen, Hufelandstr. 55, 45147 Essen, Germany