HELEXANDRA, Y.; SABRI, Y. S. .; ANGGRAINY, F. . The Relationship Between Smoking Status and Smoking Index Against COVID-19 Disease Course in Treated Patients at Dr. M Djamil General Hospital, Padang. Respiratory Science, [S. l.], v. 3, n. 1, p. 51-66, 2022. DOI: 10.36497/respirsci.v3i1.58. Disponível em: https://mail.respiratoryscience.or.id/index.php/journal/article/view/58. Acesso em: 17 apr. 2026.