1. Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
2. Department of Ophthalmology and Visual Science, Carver College of Medicine, Stephen A. Wynn Institute for Vision Research, University of Iowa, Iowa City, Iowa, United States
3. Pangere Center for Hereditary Retinal Diseases, The Chicago Lighthouse, Chicago, Illinois, United States