1. Department of Anatomy; School of Medicine; Faculty of Health Sciences; University of Pretoria; Pretoria South Africa
2. Department of Anatomy; School of Pathology and Pre-Clinical Sciences; Faculty of Health Sciences; University of Limpopo (Medunsa Campus); Ga-Rankuwa South Africa
3. Department of Anesthesiology and Pain Management; Faculty of Health Sciences; University of Washington; Seattle WA USA