Mohammed, Essam Fathy http://orcid.org/0000-0002-2465-5461
Article History
Received: 20 January 2021
Accepted: 16 April 2021
First Online: 23 August 2021
Declarations
:
: The Ethics Committee of the Research Center has approved the thesis; the study adhered to the tenets of the Declaration of Helsinki. Informed written consent to participate in the study was obtained by all participants (or their parent or legal guardian in the case of children under 16). Local ethics committee approved no number available, the consent obtained from the Ear, Nose and Throat Department, Hearing and Speech Institute, General Organization for Teaching Hospitals and Institutes, Egypt.
: Written informed consent was obtained from a parent or legal guardian of participants under 16 years old for publication.
: The author declares that he has no competing interests.