1. Department of Orthopaedic Surgery, University of the Witwatersrand, Charlotte Maxeke Johannesburg Academic Hospital, Parktown, Johannesburg, 2193, South Africa
2. Division of Orthopaedic Surgery, McMaster Children's Hospital,1200 Main Street West, Hamilton, ON, L8N 3Z5, Canada
3. Centre for Sports Medicine and Orthopedics, Fourways Life Hospital, Cedar Ave West &, Cedar Rd, Fourways, Johannesburg, 2055, South Africa