Gupta, Mithilesh Kumar, Pradeep Kumar Gupta, and Rajan Panthee. “Measurement of Serum Vitamin D Level and Its Association With Rheumatoid Arthritis, A Prospective Study at Eastern Region of Nepal”. Birat Journal of Health Sciences 8, no. 2 (November 27, 2023): 2045–2049. Accessed February 5, 2026. https://www.nepjol.info/index.php/bjhs/article/view/59858.