1. Clinical Pharmacy, Netcare Christiaan Barnard Memorial Hospital, Cape Town, South Africa
2. Clinical Haematology, Netcare Garden City Hospital, Johannesburg, Gauteng, South Africa
3. Division of Pathology, National Institute for Occupational Health, National Health Laboratory Services, Johannesburg, Gauteng, South Africa
4. Division of Critical Care Charlotte Maxeke Hospital and University of the Witwatersrand, Faculty of Health Sciences