1. Department of Medical Psychology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
2. Institute of Social Work, University of Kassel, Kassel, Germany
3. Department of Medical Psychology and Medical Sociology, University Medical Center Leipzig, Leipzig, Germany
4. Department of Oncology, Hematology, and Bone Marrow Transplantation with Section of Pneumology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany