Levels of 25-hydroxycholecalciferol in human serum in all ages: seasonal differences. Revista Española de Fisiología, [S. l.], v. 43, n. 4, p. 477–482, 1987. Disponível em: https://revistas.unav.edu/index.php/ref/article/view/47014. Acesso em: 16 jul. 2025.