[1] Univ Tromsoe, Inst Clin Med, Tromso, Norway
[2] Norwegian Radium Hosp, Dept Oncol, Oslo, Norway
[3] St Olavs Hosp, Dept Oncol, Trondheim, Norway
[4] Univ Hosp Ullevaal, Dept Oncol, Oslo, Norway
[5] Haukeland Hosp, Dept Oncol, N-5021 Bergen, Norway
[6] Univ Tromsoe, Inst Community Med, Tromso, Norway
[7] Univ Hosp Tromsoe, Dept Oncol, Tromso, Norway