Autier, P., Doi, G., Mullie, P., Vankrunkelsven, P., D’Ecclesiis, O., Gandini, S. (2025). Vitamin D, acute respiratory infections, and Covid-19: The curse of small-size randomised trials. A critical review with meta-analysis of randomised trials. PLoS ONE. https://doi.org/10.1371/journal.pone.0303316