Zielińska-Sitkiewicz M. The Flu : an Analysis of Economic Costs and Morbidity Rates in Poland in the Period 2013-2019 Using Adaptive Prediction Methods. aspe [Internet]. 2020 Dec. 30 [cited 2024 Nov. 22];19(4):139-46. Available from: https://aspe.sggw.edu.pl/article/view/86