[1] Johns Hopkins Univ, McKusick Nathans Inst Genet Med, Baltimore, MD 21287 USA
[2] Johns Hopkins Univ, Wilmer Eye Inst, Baltimore, MD 21287 USA
[3] Baylor Coll Med, Dept Mol & Human Genet, Houston, TX 77030 USA
[4] Baylor Coll Med, Dept Ophthalmol, Houston, TX 77030 USA
[5] Baylor Coll Med, Dept Pediat, Houston, TX 77030 USA
[6] Baylor Coll Med, Dept Med, Houston, TX 77030 USA
[7] Texas Childrens Hosp, Baylor Coll Med, Houston, TX 77030 USA