Anyone know where is this trial happening?
@ Ayesha Hanif your question is to a thread that is four years old? The trial is likely long gone, although you could try a Google search for similar trials.
To my knowledge, the results of any trial has yet to be shown. Any success would have been shouted from the rooftops.
There have been some remarkable advance in other forms of medicine, but deafness is not one of them.