Łanowy, Patrycja, et al. “Vitamin D - Is There a Correlation Between Vitamin D Level in Serum and Caries? - Review of the Literature With Analysis of Survey Among Polish Adults about Supplementation of Vitamin D”. Journal of Education, Health and Sport, vol. 9, no. 5, May 2019, pp. 467-75, https://apcz.umk.pl/JEHS/article/view/6960.