Luedi, Chantal, Irène Frank, Christine Krähenbühl, Gisela Michel, and Erika Harju. “Psychological Distress During the COVID-19 Pandemic: Changes over Time and the Effect of Socioeconomic Status”. Swiss Medical Weekly 153, no. 9 (September 8, 2023): 40111. Accessed May 29, 2024. https://smw.ch/index.php/smw/article/view/3477.