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Ialongo C, Farina A, Labriola R, Angeloni A, Anastasi E. Vitamin D, SARS-CoV-2 and Causal Associations in Transversal Studies: The Time-Series Analysis to Reveal Potential Confounders. Comment on Gaudio et al. Vitamin D Levels Are Reduced at the Time of Hospital Admission in Sicilian SARS-CoV-2-Positive Patients. Int. J. Environ. Res. Public Health 2021, 18, 3491. International Journal of Environmental Research and Public Health. 2021; 18(13):6793. https://doi.org/10.3390/ijerph18136793

Ialongo, Cristiano, Antonella Farina, Raffaella Labriola, Antonio Angeloni, and Emanuela Anastasi. 2021. "Vitamin D, SARS-CoV-2 and Causal Associations in Transversal Studies: The Time-Series Analysis to Reveal Potential Confounders. Comment on Gaudio et al. Vitamin D Levels Are Reduced at the Time of Hospital Admission in Sicilian SARS-CoV-2-Positive Patients. Int. J. Environ. Res. Public Health 2021, 18, 3491" International Journal of Environmental Research and Public Health 18, no. 13: 6793. https://doi.org/10.3390/ijerph18136793

Ialongo, C., Farina, A., Labriola, R., Angeloni, A., & Anastasi, E. (2021). Vitamin D, SARS-CoV-2 and Causal Associations in Transversal Studies: The Time-Series Analysis to Reveal Potential Confounders. Comment on Gaudio et al. Vitamin D Levels Are Reduced at the Time of Hospital Admission in Sicilian SARS-CoV-2-Positive Patients. Int. J. Environ. Res. Public Health 2021, 18, 3491. International Journal of Environmental Research and Public Health, 18(13), 6793. https://doi.org/10.3390/ijerph18136793