Durán, Diana, and Olga Cecilia Vargas. “Stable Copd Management in Relation to the GOLD: Experience at a University Hospital”. Colombia Medica 39, no. 4 (December 30, 2008): 328–345. Accessed May 13, 2025. https://colombiamedica.univalle.edu.co/index.php/comedica/article/view/615.