1. Flinders Centre for Epidemiology and Biostatistics; School of Medicine; Flinders University; Adelaide South Australia Australia
2. Department of General Medicine; Flinders Medical Centre and Flinders University; Adelaide South Australia Australia
3. Department of Emergency Medicine; Flinders Medical Centre; Adelaide South Australia Australia
4. Department of Clinical Epidemiology; Flinders Medical Centre and Flinders University; Adelaide South Australia Australia
5. Department of Medicine; Royal Adelaide Hospital and University of Adelaide; Adelaide South Australia Australia