1. Master of Applied Epidemiology Program, Australian National University, Canberra, Australia.
2. Communicable Disease Control Branch, South Australian Department of Health, Adelaide, Australia.
3. Institute of Medical and Veterinary Science, Adelaide, Australia.
4. Hunter Area Pathology Service, Department of Microbiology, John Hunter Hospital, Newcastle, Australia.
5. School of Biomedical Sciences, University of Newcastle, Newcastle, Australia.