[1] Womens Coll Res Inst, Familial Breast Canc Res Unit, Toronto, ON, Canada
[2] Sunnybrook Hlth Sci Ctr, Dept Med Oncol, Toronto, ON M4N 3M5, Canada
[3] McGill Univ, Jewish Gen Hosp, Dept Human Genet, Montreal, PQ H3T 1E2, Canada
[4] McGill Univ, McGill Univ Hlth Ctr, Montreal, PQ H3T 1E2, Canada