Ram Ranjan Singh, Md Abu Nasar, Brajesh Kumar Singh, and Khursheed Alam. “A Comparative Study to Evaluate the Vitamin D Status in Rheumatoid Arthritis Patients”. International Journal of Health and Clinical Research 4, no. 19 (November 8, 2021): 30–32. Accessed January 15, 2025. https://ijhcr.com/index.php/ijhcr/article/view/2999.