| http://www.w3.org/ns/prov#value | - All authors read and approved the final manuscript.Pre-publication historyThe pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1472-6963/11/66/prepubAcknowledgementsThe research reported in this paper is a project of the Australian Primary Health Care Research Institute, which is supported by a grant from the Australian Government Department of Health and Ag
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