1. Collaboration for Evidence, Research and Impact in Public Health (CERIPH), School of Public Health, Curtin University, GPO BOX U1987, Bentley, Western Australia, WA 6845
2. Communicable Disease Control Directorate, Public and Aboriginal Health Division, Department of Health , CDCD, 189 Royal St, East Perth, Western Australia, WA 6004
3. Communicable Disease Control Directorate, Public and Aboriginal Health Division, Department of Health , CDCD, 189 Royal St, East Perth, Western Australia, WA 6004; School of Medicine, Fremantle, University of Notre Dame Australia, PO BOX 1225, Fremantle, Western Australia WA 6959