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APA Citation
Connolly, M., Youssef, M., O'Shea, A., Al Lawati, A., Shah, S., Walsh, S., McCartney, D., & Faul, J. (n.d.). an observational study of the association of vitamin D status and other patient characteristics with COVID-19 severity and mortality. Proceedings of the Nutrition Society, 80(3), . http://access.bl.uk/ark:/81055/vdc_100140201952.0x000058