Association of the -2549 insertion/deletion polymorphism in the promoter region of vascular endothelial growth factor towards chronic obstructive pulmonary disease susceptibility and clinical factors in the North Indian population. Monaldi Arch Chest Dis [Internet]. 2026 Oct. 7 [cited 2026 Oct. 9]; Available from: https://www.monaldi-archives.org/macd/article/view/3638