1. School of Public Health, Curtin University, Bentley, WA, Australia
2. Department of Natural Sciences, Galway Mayo Institute of Technology, Galway, Ireland
3. Department of Research and Evaluation, Kaiser Permanente, Pasadena, CA, USA
4. National Centre for Epidemiology and Population Health, Research School of Population Health, Australian National University, Canberra, ACT, Australia/Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, WA, Australia
5. Department of Research and Evaluation, Kaiser Permanente, Pasadena, CA, USA/Neurology Department, Los Angeles Medical Center, Southern California Permanente Medical Group/Kaiser Permanente, Los Angeles, CA, USA