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]. 2021Jan.3 [cited 2024May18];19(4):139-46. Available from: https://js.wne.sggw.pl/index.php/aspe/article/view/.50