APOL1 and Schnyder corneal dystrophy: Pathogenic genotypes were relatively common (Figure 2A): APOL1-mediated kidney disease (MIM:612551; n = 2,233), G6PD deficiency (MIM:305900; n = 1,549 including 248 homozygous females), hATTR (MIM:105210; n = 1,108) and sickle cell disease (SCD (MIM:603903; n = 240).