1. Department of Medicine Division of Human Genetics Faculty of Health Sciences University of Cape Town Cape Town South Africa
2. Institute of Infectious Diseases and Molecular Medicine Faculty of Health Sciences University of Cape Town Cape Town South Africa
3. Department of Pathology Division of Haematology Faculty of Health Sciences University of Cape Town Cape Town South Africa
4. Centre for Heart Rhythm Disorders South Australian Health and Medical Research Institute (SAHMRIUniversity of Adelaide and Royal Adelaide Hospital Adelaide Australia
5. Population Health Research InstituteHamilton Health Sciences and McMaster University Hamilton ON Canada