1. Department of General Internal Medicine and Psychosomatics and National Center for Tumor Diseases Heidelberg, University Hospital Heidelberg, Heidelberg, Germany;
2. Comprehensive Cancer Center, Department of Self-Help Research, Faculty of Medicine and Medical Center University of Freiburg, Freiburg, Germany;
3. Department of Medical Psychology and Psychotherapy, Medical Sociology and Rehabilitation Sciences, and Comprehensive Cancer Center Mainfranken, University of Wuerzburg, Wuerzburg, Germany;
4. Department of Psychosomatic Medicine and Psychotherapy, Medical University Hospital Tuebingen, Tuebingen, Germany;
5. Department of Psychosomatic Medicine and Psychotherapy, Comprehensive Cancer Center Ulm (CCCU), Ulm University Clinic, Ulm, Germany;
6. University Clinic Center, Hubertus Wald, University Cancer Center (CCC), Hamburg, Germany;
7. Comprehensive Cancer Center, University Clinic Center Dresden, Dresden, Germany;
8. Department of Psychosomatic Medicine and Psychotherapy, Paracelsus Medical University, General Hospital Nuremberg, Nuremberg, Germany;
9. Department of Psychosomatic Medicine and Psychotherapy, Comprehensive Cancer Center Essen (WTZ) and LVR Hospital, University of Duisburg-Essen, Essen, Germany;
10. Charité Comprehensive Cancer Center, Berlin, Germany;
11. Department of Psychosomatic Medicine, University Clinic Center Erlangen, Erlangen, Germany;
12. Department of Psychosomatic Medicine, University Clinic Center Bonn, Bonn, Germany;
13. Department of Psychosomatic Medicine & Centre Psychooncology (CePO), University Clinic Center Cologne, Cologne, Germany;
14. University Clinic Center Frankfurt, Frankfurt, Germany;
15. Institute of Medical Biometry and Informatics, University Clinic Center of Heidelberg, Heidelberg, Germany