1. W. K. Kellogg Eye Center, Department of Ophthalmology and Visual Sciences, University of Michigan Medical School, Ann Arbor
2. Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
3. Wilmer Eye Institute, Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, Maryland
4. Keck School of Medicine, Department of Ophthalmology, University of Southern California, Los Angeles