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Ibrahim Elmi, Zakaria Ali, Sighakoli, Sameer, Tetteh, John and Zand Fard, Nazanin 
ORCID: https://orcid.org/0000-0003-2058-2354
(2023)
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 and Health:e000428.
pp. 1-7.
ISSN 2516-5542 (Online)
(doi:10.1136/bmjnph-2022-000428)