1. From the Center for Corneal Genetics, Cornea and External Disease Service, the
2. From the Center for Corneal Genetics, Cornea and External Disease Service, the2Laboratory of Developmental Genetics, The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland; and the3Department of Molecular Biology and Ge
3. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.