Guleria, T. C., Mohindroo, S., Mohindroo, N. K. and Azad, R. K. (2017) “Prevalence and etiology of hearing impairment in urban area of Shimla, Himachal Pradesh, India: a cross sectional observational study”, International Journal of Research in Medical Sciences, 5(4), pp. 1252–1255. doi: 10.18203/2320-6012.ijrms20170990.