1. Department of Epidemiology; Johns Hopkins Bloomberg School of Public Health; Baltimore Maryland USA
2. Wilmer Eye Institute; Johns Hopkins University School of Medicine; Baltimore Maryland USA
3. Department of Ophthalmology; University of Colorado Denver Anschutz Medical Campus; Aurora CO USA
4. Department of Neurosciences, Psychology, Drug Research and Child Health (NEUROFARBA); University of Florence; Florence Italy
5. Centre for Public Health; Queen's University Belfast; Belfast UK