1. Perioperative Research Group, Department of Anaesthetics, University of KwaZulu-Natal, Durban; Outcomes Research Consortium, Cleveland, Ohio
2. Outcomes Research Consortium, Cleveland, Ohio; Department of Anaesthetics and Critical Care, King Edward V Hospital, Durban
3. National Health Laboratory Services; Department of Chemical Pathology, Nelson R Mandela School of Medicine, University of KwaZulu-Natal
4. Perioperative Research Group, Department of Anaesthetics, University of KwaZulu-Natal, Durban