1. Medical Radiation Physics/Radiation Protection; Universitätsmedizin Mannheim; Medical Faculty Mannheim; Heidelberg University; Mannheim D-68167 Germany
2. Department of Radiation Oncology; Universitätsmedizin Mannheim; Medical Faculty Mannheim; Heidelberg University; Mannheim D-68167 Germany
3. Medical Radiation Physics; Department of Nuclear Medicine; Ulm University; Ulm 89081 Germany
4. Department of Nuclear Medicine; Ulm University; Ulm 89081 Germany