1. Department of Intensive Care Services, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
2. Queensland University of Technology, Brisbane, Queensland, Australia
3. Correspondence: Kevin B Laupland, Intensive Care Services, Level 3 Ned Hanlon Building, Royal Brisbane and Women's Hospital, Butterfield Street, Brisbane, Queensland 4029 Australia. Telephone: 61-7-3646-4096.
4. Department of Medical Microbiology and Infectious Diseases, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
5. National Collaborating Centre for Infectious Diseases, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
6. Department of Community Health Sciences, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
7. The Manitoba HIV Program, Winnipeg, Manitoba, Canada
8. Department of Internal Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada