[1] Akershus Univ Hosp, Dept Pathol, Oslo, Norway
[2] Akershus Univ Hosp, Dept Oncol, Oslo, Norway
[3] Akershus Univ Hosp, Dept Clin Mol Biol EpiGen, Oslo, Norway
[4] Oslo Univ Hosp, Dept Pathol, Oslo, Norway
[5] Univ Oslo, Inst Clin Med, Fac Med, Oslo, Norway