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- The relationship between vitamin D and the severity of COVID-19 / Basaran N. ... [et al.] . Bratislavské lekárske listy : international journal for biomedical sciences and clinical medicine. - ISSN 0006-9248 . - Vol. 122, no. 3 (2021), s. 200-205 : ilustr., grafy, tab.
- C 526