Mathew, A. S., and A. Sridhar. “Etiological Spectrum for Dysphonia in a Rural Indian Treatment Seeking Population”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 4, no. 6, Oct. 2018, pp. 1479-84, doi:10.18203/issn.2454-5929.ijohns20184363.