[1] Univ Toronto, Inst Med Sci, Toronto, ON, Canada
[2] Hosp Sick Children, Child Hlth Evaluat Sci Program, Toronto, ON, Canada
[3] Inst Clin Evaluat Sci, ICES Cent, Toronto, ON, Canada
[4] Hosp Sick Children, Haematol Oncol, Toronto, ON, Canada
[5] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[6] Univ Toronto, Dept Med, Toronto, ON, Canada
[7] Univ Hlth Network, Div Cardiol, Peter Munk Cardiac Ctr, Toronto, ON, Canada
[8] Womens Coll Hosp, Div Cardiol, Toronto, ON, Canada