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Aetiology of children with congenital bilateral hearing loss (HL). (A) Overall, (B) moderate HL cases, and (C) severe to profound HL cases. CND, cochlear nerve deficiency; CAA, congenital aural atresia; CAS, congenital aural stenosis; cCMV, congenital cytomegalovirus; OME, otitis media with effusion
