[1] Childrens Hosp Boston, Dept Cardiol, Boston, MA 02115 USA
[2] Harvard Med Sch, Brigham & Womens Hosp, Div Cardiovasc, Boston, MA 02115 USA
[3] McGill Univ, McGill Adult Unit Congenital Heart Dis Excellence, Montreal, PQ, Canada
[4] McGill Univ, Jewish Gen Hosp, Div Cardiol, Montreal, PQ, Canada
[5] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ, Canada