P., R. P., and M. K. “A Retrospective Study on Middle Ear Risk Indices in Analysing the Post-Operative Outcome Following Tympanoplasty”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 7, no. 9, Aug. 2021, pp. 1468-72, doi:10.18203/issn.2454-5929.ijohns20213281.