1 Perioperative Research Group, Department of Anaesthetics, Critical Care and Pain Management, University of KwaZulu-Natal, Pietermaritzburg, KwaZulu-Natal, South Africa. Electronic address: [email protected].
2 Perioperative Research Group, Department of Anaesthetics, Critical Care and Pain, Management, University of KwaZulu-Natal, Pietermaritzburg, KwaZulu-Natal, South Africa; Outcomes Research Consortium, Cleveland Clinic, Cleveland, OH, United States.
3 Department of Anaesthesia and Perioperative Medicine, University of Cape Town, Cape Town, Western Cape, South Africa.