Open Access. The Published version of this work has been reproduced with permission from the Australian Physiotherapy Association. This article may be downloaded for personal use only. Any other use requires prior permission of Australian Physiotherapy Association. The following article appeared in Australian Journal of Physiotherapy, v. 54 (3), 2008. p. 159-170. More information about this publisher may be found at http://physiotherapy.asn.au/. Copyright (2008) Australian Physiotherapy Association. Romeo Blue Publisher.