[1] NHGRI, NIH, Baltimore, MD USA
[2] Univ Tennessee, Ctr Hlth Sci, Dept Genet Genom & Informat, Memphis, TN 38163 USA
[3] Inst Populat Genet, Sassari, Italy
[4] Salus Univ, Elkins Pk, PA USA
[5] Univ Penn, Dept Ophthalmol, Philadelphia, PA 19104 USA