COVID-19 and social distancing: pandemic has altered social relationships and contacts in older adults over 4 years - Kastner, Lydia; Suenkel, Ulrike; von Thaler, Anna-Katharina; Eschweiler, Gerhard W.; Dankowski, Theresa; Mychajliw, Christian; Brockmann, Kathrin; Heinzel, Sebastian; Thiel, Ansgar (Frontiers in Public Health, 2024)