1. College of Optometry; Rocky Mountain University of Health Professions; Provo UT USA
2. Department of Ophthalmology and Visual Science; The University of Chicago Medicine; Chicago IL USA
3. College of Optometry; The Ohio State University; Columbus OH USA
4. Southern California College of Optometry; Marshall B Ketchum University; Fullerton CA USA
5. Department of Ophthalmology; Loyola University Medical Center; Maywood IL USA
6. Department of Optometry and Vision Sciences; The University of Melbourne; Parkville Australia
7. Department of Ophthalmology; University of Colorado Anschutz Medical Campus; Aurora CO USA
8. Department of Epidemiology; University of Colorado Anschutz Medical Campus; Aurora CO USA