1. OzFoodNet, Communicable Disease Control, Health Protection Service, Australian Capital Territory Health Directorate, Canberra, Australia.
2. National Centre for Epidemiology and Population Health, Research School of Population Health, Australian National University, Canberra, Australia.
3. Health Protection New South Wales, New South Wales Ministry of Health, Sydney, Australia.
4. OzFoodNet, Communicable Disease Control Directorate, Government of Western Australia, Department of Health, Perth, Australia.
5. OzFoodNet, Communicable Disease Control Branch, South Australia Health, Adelaide, Australia.
6. OzFoodNet, Communicable Diseases Branch, Queensland Health, Brisbane, Australia.
7. OzFoodNet, Infectious Disease Epidemiology and Surveillance, Victorian Department of Health, Melbourne, Australia.
8. OzFoodNet, Office of Health Protection, Australian Government Department of Health, Canberra, Australia.