1 Division of Cardiology, British Columbia Children's Hospital, Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada. Electronic address: kharris2@cw.bc.ca.
2 Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada.
3 Division of Cardiology, Yasmin and Amir Virani Provincial Adult Congenital Heart Program, St Paul's Hospital, University of British Columbia, Vancouver, British Columbia, Canada.
4 Electrophysiology Service and Adult Congenital Heart Disease Centre, Montréal Heart Institute, Université de Montréal, Montréal, Québec, Canada.