Ram Ranjan Singh, Md Abu Nasar, Brajesh Kumar Singh and Khursheed Alam (2021) “A comparative study to evaluate the vitamin D status in rheumatoid arthritis patients”, International Journal of Health and Clinical Research, 4(19), pp. 30–32. Available at: https://www.ijhcr.com/index.php/ijhcr/article/view/2999 (Accessed: 5February2026).