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