1. NAFKAM, Department of Community Medicine; UiT The Arctic University of Norway; Tromsø Norway
2. University Cancer Center Hamburg; University Medical Center Hamburg Eppendorf; Hamburg Germany
3. School of Social and Community Medicine; Bristol University; Bristol UK
4. Medizinische Klinik mit Schwerpunkt Haematologie und Onkologie; Vivantes Klinikum; Berlin Germany
5. Department of Internal Medicine, Division of Oncology and Hematology; Paracelsus Medical University, Klinikum Nuremberg; Nuremberg Germany