1. Faculty of Health, University of Newcastle, Newcastle, NSW.
2. Hunter Area Health Service and John Hunter Hospital, Newcastle, NSW.
3. NHMRC Clinical Tr ials Centre, University of Sydney, Sydney, NSW.
4. Mater Centre for Integrated Health Care and General Practice, University of Queensland, Brisbane, QLD.
5. School of Epidemiology and Health Sciences, University of Manchester, Manchester, UK.
6. Department of General Practice, Adelaide University, Adelaide, SA.