KHALIL, A.; ZAIDI, S. B. Frequency of GERD in subjects with COPD: an experience from PNS SHIFA. Pakistan Journal of Chest Medicine, [S. l.], v. 14, n. 4, 2015. Disponível em: http://www.pjcm.net/index.php/pjcm/article/view/184. Acesso em: 17 apr. 2026.