1. Priority Research Centre for Health Behaviour, Faculty of Health, University of Newcastle, Callaghan, Australia
2. Hunter Medical Research Institute, New Lambton Heights, Australia
3. Faculty of Medicine, Nursing and Health Sciences, School of Psychology and Psychiatry, Monash University, Clayton, Australia
4. Centre for Clinical Epidemiology and Biostatistics, University of Newcastle, Callaghan, Australia
5. Centre for Brain and Mental Health Research, University of Newcastle, Callaghan, Australia
6. Southern Academic Primary Care Research Unit, School of Primary Health Care, Monash University, Notting Hill, Australia