1. From the Scheie Eye Institute, Department of Ophthalmology, University of Pennsylvania, Philadelphia, Pennsylvania;
2. the SNONGC (Sankara Nethralaya Oil and Natural Gas Corporation) Department of Genetics and Molecular Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, India;
3. the Section of Ophthalmology and Neuroscience, Leeds Institute of Molecular Medicine, St. James's University Hospital, Leeds, United Kingdom;
4. Howard Hughes Medical Institute and Department of Ophthalmology, University of Iowa Carver College of Medicine, Iowa City, Iowa; and
5. the Department of Ophthalmology and Visual Sciences, University of IIlinois at Chicago, Chicago, Illinois.