Received: 29 March 2020
Accepted: 11 June 2020
First Online: 2 September 2020
Ethics approval and consent to participate
: Ethics committee approval obtained from Menoufia University. As this research extracted from bigger work of MD thesis. The protocol of the thesis was accepted on 2014. Informed written Consent to participate in the study was provided by all participants. All the audiological tests included in the study were doe on a routine clinical basis in our pre and post implanted patients with no matter of invasive technique concerning the privacy of our patients.
: Not applicable.
: The authors declare that they have no competing interests.