LAXMAN KUMAR SONI; PRIYANKA SONI; DALJEET KAUR; C. R. CHOUDHARY; K.C. AGARWAL. Correlation of vitamin D deficiency with frequent exacerbations in COPD patients at tertiary care hospital in western Rajasthan. International Journal of Health and Clinical Research, [S. l.], v. 5, n. 1, p. 586–588, 2022. Disponível em: https://www.ijhcr.com/index.php/ijhcr/article/view/4709. Acesso em: 30 apr. 2024.