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M. C. Verdonck, BSc in Human Biology and Anatomy, BSc in Occupational Therapy, was Student, Biological Anthropology Research Programme, Department of Anatomy and Human Biology, Medical School, University of the Witwatersrand, Johannesburg, Gauteng, South Africa, at the time of this study. (Mailing address: 66 Bridge Street, President Ridge, Randburg 2194, South Africa)

M. Henneberg, PhD, DSc, DSc FAIBiol, is F. Wood Jones Professor of Anthropological and Comparative Anatomy and Head, Department of Anatomy and Histology, University of Adelaide, Medical School, Adelaide, South Australia. At the time of this study, he was Professor of Anatomy and Human Biology, Biological Anthropology Research Programme, Department of Anatomy and Human Biology, Medical School, University of the Witwatersrand, Johannesburg, Gauteng, South Africa