1. Centre for Health, Activity and Rehabilitation Research, School of Physiotherapy, University of Otago, Dunedin; and Redwood Physiotherapy, Christchurch, New Zealand
2. Centre for Health, Activity and Rehabilitation Research, School of Physiotherapy, University of Otago, Dunedin, New Zealand
3. Centre for Health, Activity and Rehabilitation Research, School of Physiotherapy, University of Otago, Box 56, Dunedin 9054, New Zealand