1. Haverford College; Haverford PA USA
2. Department of Ophthalmology, School of Medicine; University of Colorado Anschutz Medical Campus; Aurora CO USA
3. Department of Epidemiology, School of Public Health; University of Colorado Anschutz Medical Campus; Aurora CO USA
4. Division of Biology and Medicine; Brown University; Providence RI USA
5. Bascom Palmer Eye Institute; Miami, FL USA