Mental Health among Adults during the COVID-19 Pandemic Lockdown: A Cross-Sectional Multi-Country Comparison. - Ding K; Yang J; Chin MK; Sullivan L; Demirhan G; Violant-Holz V; Uvinha RR; Dai J; Xu X; Popeska B; Mladenova Z; Khan W; et al. (International journal of environmental research and public health, 2021)