[1]
K. Rajeev, R. S., C. C. S., S. B. Shenoy, and J. ., “Anatomical variations of maxillary and ethmoid sinus in chronic rhinosinusitis”, Int J Otorhinolaryngol Head Neck Surg, vol. 4, no. 4, pp. 1008–1012, Jun. 2018.