[1] McGill Univ, Dept Med, Montreal, PQ, Canada
[2] McGill Univ, Dept Diagnost Radiol, Montreal, PQ, Canada
[3] McGill Univ, Ctr Outcomes Res & Evaluat, Res Inst, Hlth Ctr, Montreal, PQ, Canada
[4] Univ Alberta, Fac Med & Dent, Edmonton, AB, Canada
[5] Univ Calgary, Dept Cardiac Sci, Calgary, AB, Canada
[6] Univ Calgary, Libin Cardiovasc Inst Alberta, Calgary, AB, Canada