A gene therapy that has allowed several children born deaf to hear for the first time is being hailed as a "game changer" that raises hopes of the first new treatment for hereditary deafness in decades.
Several medical teams around the world are trialing the procedure, which focuses on a rare genetic mutation that affects only a small number of the 26 million people with congenital deafness globally.
But several success stories announced this week are already being seen as a turning point.
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