Puthukudy, P. A., Feshan, M. and Karuthedath, S. (2022) “A 3 years retrospective observational study of pure tone audiometry in a tertiary railway hospital”, International Journal of Otorhinolaryngology and Head and Neck Surgery, 8(4), pp. 348–355. doi: 10.18203/issn.2454-5929.ijohns20220802.