[1] Univ Hosp N Norway, Dept Clin Pathol, N-9038 Tromso, Norway
[2] Univ Tromso, Inst Med Biol, Fac Hlth Sci, Tromso, Norway
[3] Nordland Cent Hosp, Dept Pathol, Bodo, Norway
[4] Univ Tromso, Inst Clin Med, Fac Hlth Sci, Tromso, Norway
[5] Univ Hosp N Norway, Dept Oncol, N-9038 Tromso, Norway