1. University of Colorado, Colorado School of Public Health Department of Epidemiology Aurora Colorado USA
2. Johns Hopkins Bloomberg School of Public Health Department of Epidemiology Baltimore Maryland USA
3. Department of Ophthalmology University of Colorado, Anschutz Medical Campus Aurora Colorado USA
4. Johns Hopkins Zanvyl Krieger School of Arts and Sciences Baltimore Maryland USA
5. Department of Neurology University of Colorado, Anschutz Medical Campus Aurora Colorado USA
6. Johns Hopkins School of Nursing Baltimore Maryland USA
7. École d'optométrie Université de Montréal Montreal Canada