Raczkiewicz, Przemysław, Natalia Śmiech, Tomasz Korzec, Konrad Kania, and Marlena Kaczerska. 2021. “COVID-19 and Threats to Pregnancy and the Fetus”. Journal of Education, Health and Sport 11 (4):11-17. https://doi.org/10.12775/JEHS.2021.11.04.001.