THE IMPACT OF VITAMIN D DEFICIENCY ON IMMUNE SYSTEM FUNCTION IN CHILDREN: A LONGITUDINAL STUDY. Frontier in Medical and Health Research, [S. l.], v. 4, n. 1, p. 904–919, 2026. Disponível em: https://fmhr.net/index.php/fmhr/article/view/2270.. Acesso em: 6 nov. 2026.