1. L.G. Macedo, PT, PhD, Common Spinal Disorders Research Group, Department of Physical Therapy, University of Alberta, 2-50 Corbett Hall, Edmonton, Alberta, Canada T6G 2G4.
2. G.P. Bostick, PT, PhD, Department of Physical Therapy, University of Alberta.
3. C.G. Maher, PT, PhD, The George Institute for Global Health, Sydney, Sydney Medical School, The University of Sydney, New South Wales, Australia.