Letter to the editor: Excess all-cause mortality during second wave of COVID-19 – the Polish perspective
Grabowski, Jakub and Witkowska, Natalia and Bidzan, Leszek, Eurosurveillance, 26, 2100117 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.7.2100117