1. World Health Organisation (2013) Millions of people in the world have hearing loss that can be treated or prevented. Geneva:1–17. https://www.who.int/pbd/deafness/news/Millionslivewithhearingloss.pdf?ua=1
2. World Health Organisation (2009) State of hearing and ear care in the South East Asia Region. WHO Regional Office for South East Asia. WHO-SEARO. SEA/Deaf/9. 2009.48. https://apps.who.int/iris/bitstream/handle/10665/205911/B1466.pdf?sequence=1&ua=1
3. Vignesh SS, Jaya V, Sasireka BI, Sarathy K, Vanthana M (2015) Prevalence and referral rates in neonatal hearing screening program using two step hearing screening protocol in Chennai – A prospective study. Int J Pediatr Otorhinolaryngol 79(10):1745–7. https://doi.org/10.1016/j.ijporl.2015.07.043
4. Nagapoornima P, Ramesh A, Rao S, Patricia PL, Gore M, Dominic M (2007) Universal hearing screening. Indian J Pediatr 74(6):545–9. https://doi.org/10.1007/s12098-007-0105-z
5. National Sample Survey Organisation (2002) Disabled persons in India National Sample Survey, 58th round, July - December 2002. Ministry of Statistics and Programme Implementation, Govt. of India 2003