1. Department of Medical Oncology, National Center for Tumor Diseases, Heidelberg University Hospital, 69120 Heidelberg, Germany
2. Department of Sports Medicine, Charité—Universitätsmedizin Berlin, 10115 Berlin, Germany
3. Department of Sports Medicine, Humboldt—Universität zu Berlin, 10115 Berlin, Germany
4. West German Cancer Center, University Hospital Essen, 45122 Essen, Germany
5. Department I of Internal Medicine, Center of Integrated Oncology Aachen Bonn Cologne Düsseldorf, University Hospital of Cologne, 50937 Cologne, Germany