1. Division of Plastic, Reconstructive & Maxillofacial Surgery, University of Cape Town, Rondebosch, South Africa
2. Pulmonology, Kingsbury Hospital, University of Cape Town, Rondebosch, South Africa
3. Vincent Pallotti Hospital, University of Cape Town, Rondebosch, South Africa
4. Anaesthesiology, Kingsbury Hospital, University of Cape Town, Rondebosch, South Africa