1. School of Health Studies and Education, Saint Joseph’s University, Philadelphia, Pennsylvania, USA
2. Department of Statistics, University of Fort Hare, Alice Campus, Alice, South Africa
3. GMMDC, Nelson Mandela University, Port Elizabeth, South Africa
4. Department of Anthropology, Haverford College, Haverford, Pennsylvania, USA
5. School of Mathematics, Statistics and Computer Science, University of KwaZulu Natal, Pietermaritzburg, South Africa