Söbü et al., The Journal of Current Pediatrics,
doi:10.4274/jcp.2021.0002 (Peer Reviewed)
Vitamin D Levels of COVID-19 Positive Sypmtomatic Pediatric Cases
Retrospective 30 hospitalized pediatric COVID-19 patients and 82 healthy controls, showing significantly lower vitamin D levels in COVID-19 patients.
Söbü et al., 2/2/2021, peer-reviewed, 4 authors.