EDNRB and Waardenburg syndrome: The presence of pathogenic variants in the genes EYA1, SIX1, SIX5, PAX3, MITF, SNAI2, SOX10, EDN3, and EDNRB was also investigated in this cohort, but did not detect any potential pathogenic variant in these genes associated with BOR, BO and Waardenburg syndromes.