BAIG, Amna; SIDDIQ, Shazia; BUTT, Mehwish Rasheed; SALIK, Sabah. Association of Serum Vitamin D Levels in Acute Exacerbation of COPD. Indus Journal of Bioscience Research, [S. l.], v. 3, n. 5, p. 1010–1014, 2025. DOI: 10.70749/ijbr.v3i5.2209. Disponível em: https://ijbr.com.pk/IJBR/article/view/2209. Acesso em: 31 may. 2026.