CDC (21 Mar 2019). "Types of Hearing Loss | CDC". Centers for Disease Control and Prevention (بالإنجليزية الأمريكية). Archived from the original on 2021-07-31. Retrieved 2020-03-18.
CDC (21 Mar 2019). "Types of Hearing Loss | CDC". Centers for Disease Control and Prevention (بالإنجليزية الأمريكية). Archived from the original on 2021-07-31. Retrieved 2020-03-18.