1. World Health Organization: the global guardian of public health. In: About WHO. 2016. Available at: http://www.who.int/about/structure/global-guardian-of-public-health.pdf?ua=1. Accessed July 31, 2017.
2. World Health Assembly (WHA) resolution on prevention of hearing impairment [WHA resolution 48.9] In: WHO Prevention of blindness and deafness. 1995. Available at: http://www.who.int/pbd/deafness/en/english.pdf?ua=1. Accessed July 31, 2017.
3. Multi-country assessment of national capacity to provide hearing care. In: WHO documents & publications. 2013. Available at: http://www.who.int/pbd/publications/WHOReportHearingCare_Englishweb.pdf. Accessed July 31, 2017.
4. WHO global estimates on prevalence of hearing loss. In: WHO prevention of blindness and deafness. 2012. Available at: http://www.who.int/pbd/deafness/WHO_GE_HL.pdf?ua=1. Accessed July 31, 2017.
5. World Health Organization metrics: Disability-Adjusted Life Year (DALY). In: WHO health statistics and information systems. 2017. Available at: http://www.who.int/healthinfo/global_burden_disease/metrics_daly/en/. Accessed July 31, 2017.