1. Discipline of Ophthalmology, College of Medicine and Public Health, Flinders University, South Australia, Australia
2. Registry of Senior Australians (ROSA), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia, Australia
3. Health and Social Care Economics Group, College of Nursing and Health Sciences, Flinders University, South Australia, Australia
4. Institute for Choice, Business School, University of South Australia, South Australia, Australia
5. Division of Health Sciences, University of South Australia, Adelaide, South Australia, Australia