SHOUKAT, S.; IRSHAD, S.; FIDA, N.; MUSTAFA, A.; SHAH, R.; KHAN, M. Impact of Vitamin D on Respiratory Function and Immune Health on Patients with Chronic Obstructive Pulmonary Disease: A Systematic Review. Pakistan Journal of Chest Medicine, [S. l.], v. 28, n. 4, p. 522–529, 2022. Disponível em: https://www.pjcm.net/index.php/pjcm/article/view/876. Acesso em: 30 oct. 2025.