1. Shiley Eye Institute, University of California San Diego, La Jolla, California.
2. Department of Ophthalmology and Visual sciences, Kentucky Lions Eye Center, University of Louisville, Louisville, Kentucky.
3. Scheie Eye Institute, Department of Ophthalmology, University of Pennsylvania, Philadelphia, Pennsylvania.
4. Department of Genetics-Research Unit, Institute of Ophthalmology, Conde de Valenciana, Mexico City, Mexico.
5. Department of Biochemistry, Faculty of Medicine, UNAM, Mexico City, Mexico.
6. Department of Ophthalmology, College of Medicine, University of Florida, Gainesville, Florida.
7. Department of Ophthalmology, The University of Tennessee Health Science Center, Hamilton Eye Institute, University of Tennessee, Memphis, Tennessee.