E., A.; JAYANNA, M.; REDDY, N. N. Vitamin D deficiency as a risk factor for COVID-19 infection in children. International Journal of Contemporary Pediatrics, [S. l.], v. 8, n. 7, p. 1209–1215, 2021. DOI: 10.18203/2349-3291.ijcp20212474. Disponível em: https://www.ijpediatrics.com/index.php/ijcp/article/view/4250. Acesso em: 24 oct. 2025.