1 Department of Anaesthesia, University of Cape Town and Groote Schuur Hospital, Anzio Road, Cape Town, Western Cape, 7925, South Africa. mike.james@uct.ac.za.
2 Division of Critical Care and Department of Anaesthesia, University of Cape Town and Groote Schuur Hospital, Cape Town, Western Cape, South Africa.
3 Division of Critical Care and Department of Surgery, University of Cape Town and Groote Schuur Hospital, Anzio Road, Cape Town, Western Cape, 7925, South Africa.
4 Trauma Unit, Division of General Surgery, University of Cape Town and Groote Schuur Hospital, Anzio Road, Cape Town, Western Cape, 7925, South Africa.
5 Department of Anaesthesia, University of Cape Town and Groote Schuur Hospital, Anzio Road, Cape Town, Western Cape, 7925, South Africa.