1. Department of Human Biology, University of Cape Town, Observatory 7925, South Africa
2. Lodox Systems, 7 Dartfield Road, Sandton, Johannesburg 2146, South Africa
3. Department of Otorhinolaryngology, Head and Neck Surgery, Insel Hospital, 3010 Bern, Switzerland
4. Department of Radiology, Insel Hospital, Freiburgstraße, 3010 Bern, Switzerland
5. Department of Emergency Medicine, Insel Hospital, Freiburgstraße, 3010 Bern, Switzerland