ABCA4 and retinitis pigmentosa: 90% (190/211) of molecularly solved patients had a clinical diagnosis of STGD1, 4% (9/211) had a clinical diagnosis of cone dystrophy, 3% (6/211) had retinitis pigmentosa, and 3% (6/211) had an unspecified macular dystrophy.While a total of 211 index cases had biallelic pathogenic variants in ABCA4 confirming a ABCA4R diagnosis, a subgroup of 18 patients were shown to carry a single disease-causing variant in this gene and thus were considered as unsolved (data not shown).