Helexandra, Yulia, Yessy Susanty Sabri, and Fenty Anggrainy. “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 3, no. 1 (September 15, 2022): 51-66. Accessed April 19, 2026. https://mail.respiratoryscience.or.id/index.php/journal/article/view/58.