Drop, Bartłomiej, Mariola Janiszewska, and Katarzyna Drop Katarzyna Drop. “COVID-19 – As a Global Problem of Public Health”. Polish Journal of Public Health 129, no. 4 (September 14, 2020): 118–122. Accessed July 7, 2025. https://czasopisma.umlub.pl/pjph/article/view/1094.