1. Burwood Academy Trust, Christchurch, New Zealand
2. Department of Medicine, University of Otago Wellington, Wellington South, New Zealand
3. Department of Orthopaedic Surgery and Musculoskeletal Medicine, University of Otago, Christchurch, New Zealand
4. New Zealand Spinal Trust, Christchurch, New Zealand
5. Menzies Health Institute, Griffith University, QL, Australia
6. Department of Preventive and Social Medicine, University of Otago, Dunedin, New Zealand