Philippe Autier, Giulia Doi, Patrick Mullie, Patrick Vankrunkelsven, Oriana D’Ecclesiis, Sara Gandini. "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, 2025. doi:10.1371/journal.pone.0303316