Kumar, R. ., R. Ranjan, P. P. . Singh, K. . Pranay, and D. Kumar. “Association of Serum Vitamin D Levels in Patients With Allergic Rhinitis at a Tertiary Care Health Centre in Bihar”. International Journal of Medical and Biomedical Studies, vol. 9, no. 5, Sept. 2025, pp. 1-5, doi:10.32553/ijmbs.v9i5.3111.