KHAN, A. A.; ALI, S.; ASHRAF, S.; AFRIDI, M. Z. Frequency of Common Risk factors in Patients with stable Chronic Obstructive Pulmonary Disease. Pakistan Journal of Chest Medicine, [S. l.], v. 22, n. 2, p. 55–60, 2016. Disponível em: https://www.pjcm.net/index.php/pjcm/article/view/390. Acesso em: 12 jun. 2026.