ABBAS, S. A.; SABOOR, S.; ABBAS, S. N. Prevalence of comorbidities in patients admitted with acute exacerbation of COPD in a tertiary care hospital. Pakistan Journal of Chest Medicine, [S. l.], v. 24, n. 3, p. 152–157, 2018. Disponível em: https://pjcm.net/index.php/pjcm/article/view/545. Acesso em: 31 may. 2026.