1. Department of Internal Medicine, Division of Nephrology, University of the Free State, Bloemfontein, South Africa;
2. Inkosi Albert Luthuli Central Hospital, Durban, South Africa;
3. Department of Medical Microbiology, School of Laboratory Medicine & Medical Science, University of KwaZulu-Natal, Durban, South Africa;
4. Department of Nephrology, University of KwaZulu-Natal, Durban, South Africa