The BARD1 Cys557Ser variant and breast cancer risk in Iceland. oleh Simon N Stacey, Patrick Sulem, Oskar T Johannsson, Agnar Helgason, Julius Gudmundsson, Jelena P Kostic, Kristleifur Kristjansson, Thora Jonsdottir, Helgi Sigurdsson, Jon Hrafnkelsson, Jakob Johannsson, Thorarinn Sveinsson, Gardar Myrdal, Hlynur Niels Grimsson, Jon T Bergthorsson, Laufey T Amundadottir, Jeffrey R Gulcher, Unnur Thorsteinsdottir, Augustine Kong, Kari Stefansson