1 Department of Pathology and Molecular Medicine, Queen's University, Kingston, ON, Canada.
2 Department of Medicine, Queen's University, Kingston, ON, Canada.
3 Department of Public Health Sciences, Queen's University, Kingston, ON, Canada.
4 Department of Medicine, University of Calgary, Calgary, AB, Canada.
5 Faculty of Health Sciences, Department of Molecular Medicine and Haematology, School of Pathology, University of Witwatersrand and the NHLS, Johannesburg, South Africa.