RAM RANJAN SINGH; MD ABU NASAR; BRAJESH KUMAR SINGH; KHURSHEED ALAM. A comparative study to evaluate the vitamin D status in rheumatoid arthritis patients. International Journal of Health and Clinical Research, [S. l.], v. 4, n. 19, p. 30–32, 2021. Disponível em: https://www.ijhcr.com/index.php/ijhcr/article/view/2999. Acesso em: 5 feb. 2026.