[1] Oslo Univ Hosp, Inst Canc Res, Dept Canc Genet, Oslo, Norway
[2] Univ Oslo, Inst Clin Med, Fac Med, Oslo, Norway
[3] Oslo Univ Hosp, Oslo Ctr Biostat & Epidemiol, Oslo, Norway
[4] Univ Oslo, Dept Biostat, Oslo, Norway
[5] Oslo Breast Canc Res Consortium OSBREAC, Oslo, Norway
[6] CEA Inst Biol Francois Jacob, Ctr Natl Rech Genom Humaine, Lab Epigenet & Environm, Evry, France
[7] Fdn IRCCS Ist Nazl Tumori, Dept Appl Res & Tech Dev, Milan, Italy
[8] Uppsala Univ, Dept Surg Sci, Uppsala, Sweden
[9] Uppsala Acad Hosp, Dept Surg, Uppsala, Sweden