Bothra, J., H. Swami, P. K. Sahu, and L. Goyal. “The Role of Middle Ear Risk Index on the Outcome of Surgery for Chronic Otitis Media”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 8, no. 11, Oct. 2022, pp. 889-94, doi:10.18203/issn.2454-5929.ijohns20222678.