[1] The Norwegian Radium Hosp, Dept Med Oncol & Radiotherapy, Oslo, Norway
[2] Odense Univ Hosp, Dept Oncol, DK-5000 Odense, Denmark
[3] Helsinki Univ Cent Hosp, Dept Oncol, Helsinki, Finland
[4] Sahlgrens Univ Hosp, Dept Oncol, S-41345 Gothenburg, Sweden
[5] Copenhagen Univ Hosp, Rigshosp, Dept Oncol, Copenhagen, Denmark