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Case–control study of serum vitamin D concentrations in hospitalised patients with COVID-19 and hospitalised controls suffering with respiratory tract infections of differing aetiology

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Cite this article as:
Elmi ZAI, Sighakoli S, Tetteh J, et al
Case–control study of serum vitamin D concentrations in hospitalised patients with COVID-19 and hospitalised controls suffering with respiratory tract infections of differing aetiology
BMJ Nutrition, Prevention & Health 2023;6:doi: 10.1136/bmjnph-2022-000428