STUDY OF CLINICAL AND IMMUNOLOGICAL FEATURES OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE AND ITS COMBINATION WITH COVID -19 PNEUMONIA. International Bulletin of Medical Sciences and Clinical Research, [S. l.], v. 3, n. 6, p. 125–131, 2023. Disponível em: https://researchcitations.com/index.php/ibmscr/article/view/1958. Acesso em: 12 oct. 2025.