Sahni D, Bagri D, Bhagat S, Sharma D, Singh J. A study to evaluate the relationship between serum vitamin d level and chronic rhinosinusitis. Int J Otorhinolaryngol Head Neck Surg [Internet]. 2019 Aug. 27 [cited 2025 Nov. 1];5(5):1388-93. Available from: https://www.ijorl.com/index.php/ijorl/article/view/1659