1. Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia
2. Department of Orthopaedics, Royal North Shore Hospital, St Leonards, New South Wales, Australia
3. Department of Orthopaedics, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
4. Department of Orthopaedics, Concord Repatriation General Hospital, Concord, New South Wales, Australia