1. Division of Cardiology; Memorial University; St. John's; Newfoundland; Canada
2. Discipline of Genetics; Memorial University, Health Sciences Centre; St. John's; Newfoundland; Canada
3. Institute of Cardiovascular Science; University College London and The Heart Hospital, University College London Hospitals Trust; London; UK
4. Division of Pathology; James Paton Memorial Hospital; Gander; Newfoundland; Canada
5. Clinical Genetics Research Program; Centre for Addiction & Mental Health, University of Toronto; Toronto; Ontario; Canada
6. Clinical Epidemiology Unit; Memorial University, Health Sciences Centre; St. John's; Newfoundland; Canada