1. Scheie Eye Institute, Department of Ophthalmology, University of Pennsylvania, Philadelphia, Pennsylvania
2. Stein Eye Institute, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California
3. Kresge Eye Institute, Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, Detroit, Michigan
4. Department of Ophthalmology, Emory University School of Medicine, Atlanta, Georgia
5. Department of Ophthalmology and Visual Sciences, University of Iowa Hospitals and Clinics, Iowa City, Iowa
6. Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
7. Department of Ophthalmology and Visual Sciences, Montefiore Medical Center / Albert Einstein College of Medicine, Bronx, New York