Changes in risk of death from breast cancer with season and latitude: sun exposure and breast cancer survival in Norway

Porojnicu AC, Lagunova Z, Robsahm TE, Berg JP, Dahlback A, Moan J. Changes in risk of death from breast cancer with season and latitude: sun exposure and breast cancer survival in Norway. Breast Cancer Res Treat 2007; 102(3):323-328.