1. Human Genetics Center, School of Public Health, The University of Texas Health Science Center at Houston, P.O. Box 20186, Houston, TX 77225, USA
2. Valley Retina Institute, McAllen, TX 78503, USA
3. Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA
4. Division of Endocrinology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
5. Department of Human Genetics, The University of Chicago, Chicago, IL 60637, USA