[1] Univ Punjab, Natl Ctr Excellence Mol Biol, Lahore 53700, Pakistan
[2] Johns Hopkins Univ, Sch Med, Wilmer Eye Inst, Baltimore, MD 21287 USA
[3] NEI, Ophthalm Genet & Visual Funct Branch, NIH, Bethesda, MD 20892 USA
[4] Southern Med Univ, Zhujiang Hosp, Dept Ophthalmol, Guangzhou 515282, Peoples R China
[5] Univ Hlth Sci, Allama Iqbal Med Coll, Lahore 54550, Pakistan
[6] Univ Calif San Diego, Shiley Eye Inst, La Jolla, CA 92093 USA