OTOF and hearing loss disorder: It was previously reported that OTOF mutations accounted for 1.4–8.3% of non-syndromic hearing loss patients: 2.3% (13/557) in Pakistani[20], 3.2% (23/708) in Spanish[21], 8.3% (1/12) in Turkish[22], 2.6% (1/38) in Iranian[23] and 1.4% (1/73) in Chinese[24] populations.