1. Senior Anaesthetist, Department of Anaesthesia, Johannesburg Hospital, and University of the Witwatersrand.
2. Registrar, Department of Anesthesia, Johannesburg Hospital, and University of the Witwatersrand.
3. Professor and Chief Anaesthetist, Department of Anaesthesia, Baragwanath Hospital, and University of the Witwatersrand.
4. Head of the Clinical Neuromuscular Research Laboratory, Department of Physiology, University of the Witwatersrand.
5. Principal Gastroenterologist, Department of Medicine, Johannesburg Hospital, and University of the Witwatersrand.
6. Section Head, Medical Affairs, Norwich Eaton Pharmaceuticals, Inc., Norwich, New York.