1. School of Medicine and Public Health, Faculty of Health and Medicine University of Newcastle Callaghan New South Wales Australia
2. Clinical Research Design, IT, and Statistical Support (CReDITSS) Unit Hunter Medical Research Institute (HMRI) New Lambton Heights New South Wales Australia
3. School of Public Health University of Sydney Sydney New South Wales Australia
4. Hunter New England Population Health Hunter New England Local Health District Wallsend New South Wales Australia