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http://www.who.int/pbd/deafness/activities/strategies/en/
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http://www.euro.who.int/__data/assets/pdf_file/0008/136466/e94888.pdf
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http://ec.europa.eu/health/ph_risk/committees/04_scenihr/docs/scenihr_o_017.pdf
5. Effects of long-term non-traumatic noise exposure on the adult central auditory system. Hearing problems without hearing loss