BREAKTHROUGH - step forward, ROOT cause - underlying cause, DIMINISHED hearing - impaired hearing, They STUCK probes - They inserted probes, THIN END OF THE WEDGE - slippery slope, CARRIED OUT a survey - undertook a survey, PAVE THE WAY FOR - lead to, to be DOWN to - due to, NEGATIVE side-effects - adverse, genetic CONDITION - genetic disorder, CREATED a way - devised,

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