1. Department of Anaesthesia, University of Cape Town, Cape Town and University of Witwatersrand, Johannesburg, Republic of South Africa
2. Department of Anaesthesia, Groote Schuur Hospital and University of Cape Town.
3. Department of Anaesthesia, Chris Hani Baragwanath Hospital and University of the Witwatersrand.
4. Department of Anaesthesia, University of the Witwatersrand.
5. Department of Anaesthesia, Red Cross War Memorial Childrens Hospital and University of Cape Town.
6. Department of Anaesthesia, University of Cape Town.