AFTER impatiently outside the maternity ward on November 7, 1997, Lyndon Nkomo – a Zimbabwean-based lawyer - was overjoyed to receive news that he was father to a baby boy. But for the next two years, baby Dumisani would not respond to sounds. "I would shout and cheer at the top of my voice, but the baby would not startle at the loud sounds but remained unusually quiet," said Nkomo. Perplexed by the unusual scenario, the parents took their baby to the doctor. "It was a Damascan moment of my life when the audiologist who performed the tests established that…