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Ewa Kupcewicz, Marzena Mikla, Helena Kaducáková, Daria Schneider-Matyka and Elzbieta Grochans
(1) The COVID-19 outbreak brought about several socio-economic changes and has had a negative impact on the mental health of people around the world. The aim of this study was to examine the correlation between health behaviours and dispositional optimis...
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