1. Hunter New England Population Health; Wallsend; New South Wales
2. School of Medicine and Public Health; University of Newcastle; New South Wales
3. Hunter Medical Research Institute; New Lambton Heights; New South Wales
4. Priority Research Centre for Health Behaviour; University of Newcastle; New South Wales
5. Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences; University of Oxford; United Kingdom