L. Restimulia, D. R. Pawarti, and H. M. Ekorini, “The Relationship between Serum Vitamin D Levels with Allergic Rhinitis Incidence and Total Nasal Symptom Score in Allergic Rhinitis Patients”, Open Access Maced J Med Sci, vol. 6, no. 8, pp. 1405–1409, Aug. 2018.