1. From the Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts;
2. the Department of Ophthalmology and Visual Science, University of Texas Health Science Center at Houston, Houston, Texas;
3. the Centre for Human Genetics and Molecular Medicine, Sindh Institute of Urology and Transplantation, Karachi, Pakistan; and
4. the Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, Illinois.