Association of vitamin D deficiency with COVID-19 severity and mortality in Iranian people: a prospective observational study
Acute and Critical Care. 2021;36(4):300-307 
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. 2021;80(OCE3):
Vitamin D Deficiency Is Associated with COVID-19 Incidence and Disease Severity in Chinese People
The Journal of Nutrition. 2020;151(1):98-103
Vitamin D Deficiency is Associated with Increased COVID-19 Severity: Prospective Screening of At-Risk Groups is Medically Indicated
. 2020;
Association of vitamin D status with COVID‐19 disease severity in pediatric patients: A retrospective observational study
Health Science Reports. 2022;5(3):
Corrigendum for Luo et al. Vitamin D Deficiency Is Inversely Associated with COVID-19 Incidence and Disease Severity in Chinese People. J Nutr 2020;151(1): 98–103.
The Journal of Nutrition. 2021;151(3):742-743
Association of Nonalcoholic Fatty Liver Disease With COVID-19 Severity and Pulmonary Thrombosis: CovidFAT, a Prospective, Observational Cohort Study
Open Forum Infectious Diseases. 2022;9(4):
A systematic review investigating the risk of COVID-19 severity and mortality associated with vitamin D sufficiency and deficiency within the adult population
Proceedings of the Nutrition Society. 2022;81(OCE1):
Factors related to COVID-19 severity and mortality based on comparison between Henan and Zhejiang: an observational study
. 2020;
Factors related to COVID-19 severity and mortality based on comparison between Henan and Zhejiang: an observational study
. 2020;