1. From the Departments of Oncology, Rotterdam Cancer Institute and Erasmus University Hospital, Rotterdam, The Netherlands
2. Department of Haematology, The General Infirmary, Leeds, England
3. Department of Medical Oncology and Radiotherapy, Norwegian Radium Hospital, Oslo, Norway
4. Department of Urology, Middelheim Hospital, Antwerp, Belgium
5. Department of Clinical Oncology, University Hospital, Leiden, The Netherlands