Determination of vitamin D serum levels in patients diagnosed with multiple sclerosis and their relationship with the severity and illness behavior in the Metropolitan Hospital in Quito and Carlos Andrade Marín Hospital. Medical-Scientific Journal CAMbios HECAM, [S. l.], v. 15, n. 1, p. 52–55, 2016. DOI: 10.36015/cambios.v15.n1.2016.199. Disponível em: https://revistahcam.iess.gob.ec/index.php/cambios/article/view/199. Acesso em: 12 nov. 2026.