ABCA4 and retinal disorder: Furthermore, the female-to-maleratio among all 1060 ABCA4-associated retinopathy cases at theColumbia center is 54:46 in the entire disease cohort and 57:43 in the sub-cohortwith the p.(Asn1868Ile) allele (100 cases) (J. Zernant, W. Lee, R. Allikmets,unpublished data).