1. Department of Ophthalmology; Inje University Seoul Paik Hospital; Seoul Korea, South
2. Department of Ophthalmology; University of Colorado Denver Anschutz Medical Campus; Aurora Colorado USA
3. Department of Epidemiology; Johns Hopkins Bloomberg School of Public Health; Baltimore Maryland USA
4. Wilmer Eye Institute; Johns Hopkins University School of Medicine; Baltimore Maryland USA
5. Ophthalmology & Visual Sciences; University of Michigan; Ann Arbor Michigan USA