1 Department of Chemical Pathology and National Health Laboratory Service, Tshwane Academic Division, Faculty of Health Sciences, University of Pretoria, South Africa.
2 Department of Forensic Medicine, Faculty of Health Sciences, University of Pretoria, South Africa.
3 Department of Haematology and National Health Laboratory Service, Tshwane Academic Division, Faculty of Health Sciences, University of Pretoria, South Africa.
4 Division of Chemical Pathology, University of Cape Town, South Africa.