Puthukudy, Preetham A., Musarrat Feshan, and Sowmya Karuthedath. 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):348-55. https://doi.org/10.18203/issn.2454-5929.ijohns20220802.