Association between smoking, e-cigarette use and severe COVID-19: a cohort study.
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Gao M, et al. Among authors: clift ak.
Int J Epidemiol. 2022 Aug 10;51(4):1062-1072. doi: 10.1093/ije/dyac028.
Int J Epidemiol. 2022.
PMID: 35179598
Free PMC article.