1. CG Maher, PT, PhD, is Associate Professor, School of Physiotherapy, Faculty of Health Sciences, The University of Sydney, PO Box 170, Lidcombe, New South Wales 1825, Australia
2. C Sherrington, PT, PhD, is Research Fellow, Prince of Wales Medical Research Institute, University of New South Wales, Sydney, New South Wales, Australia
3. M Elkins, PT, M-HSc, is Research Physiotherapist, Department of Respiratory Medicine, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
4. RD Herbert, PT, PhD, is Senior Lecturer, School of Physiotherapy, The University of Sydney
5. AM Moseley, PT, PhD, is Lecturer, Rehabilitation Studies Unit, Faculty of Medicine, The University of Sydney