Młodożeniec, A., Szul, P. and Gala-Błądzińska, A. 2020. Gastrointestinal symptoms as antecedent signs of severe acute respiratory syndrome coronavirus 2 infection. European Journal of Clinical and Experimental Medicine. 18, 4 (Dec. 2020), 323–325. DOI:https://doi.org/10.15584/ejcem.2020.4.9.