DOI:
10.1055/s-00025477
International Archives of Otorhinolaryngology
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References
World Health Organization (WHO).
Prevention of blindness and deafness. Grades of hearing impairment [Internet].
Genebra: World Health Organization (WHO; 2016. [cited 2016 May 5]. Available from:
http://www.who.int/pbd/deafness/hearing_impairment_grades/en/
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