1. Norwegian Radium Hospital, Oslo, Norway;
2. Department of Oncology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark;
3. Department of Oncology, Aarhus University Hospital, Aarhus N, Denmark;
4. Department of Oncology, Odense University Hospital, Odense C, Denmark;
5. Department of Oncology, Aalborg University Hospital, Aalborg, Denmark;
6. Department of Experimental Clinical Oncology, Aarhus University Hospital, Aarhus, Denmark