Hasni, Imraatul, Dien Gusta Anggraini Nursal, Yessy Markolinda, Masrizal Masrizal, and Yusmayanti Yusmayanti. “Relationship of Smoking Risk Factors and Comorbids With Covid-19 Mortality: Systematic Review and Meta-Analysis”. Jurnal Kesehatan Masyarakat Andalas 16, no. 1 (September 1, 2022): 3–17. Accessed December 20, 2024. https://jurnal.fkm.unand.ac.id/index.php/jkma/article/view/798.