1 Maxillo-Facial Surgery Practice, Life Wilgers Hospital, Pretoria, South Africa. Electronic address: sanetbithrey@gmail.com.
2 Department of Oral and Maxillofacial Surgery, University of Leipzig, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany. Electronic address: elisabeth.grau@medizin.uni-leipzig.de.
3 Maxillo-Facial Surgery Practice, Life Wilgers Hospital, Pretoria, South Africa. Electronic address: kurt@butow.co.za.