1 Department of Pediatrics, Chungnam National University Sejong Hospital, Chungnam National University School of Medicine, Sejong, Korea.
2 Division of Cardiology, Labatt Family Heart Centre, Hospital for Sick Children, Toronto, Ontario, Canada.
3 Division of Rheumatology, Hospital for Sick Children, Toronto, Ontario, Canada.
4 Division of Cardiology, Department of Pediatrics, Morgan Stanley Children's Hospital of New York Presbyterian, Columbia University Medical Center, New York, New York, USA.
5 Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.
6 Division of Cardiology, McMaster Children's Hospital, Hamilton, Ontario, Canada.