Ulyte, A., Radtke, T., Abela, I. A., Haile, S. R., Ammann, P., Berger, C., Trkola, A., Fehr, J., Puhan, M. A., & Kriemler, S. (2021). Evolution of SARS-CoV-2 seroprevalence and clusters in school children from June 2020 to April 2021: prospective cohort study Ciao Corona. Swiss Medical Weekly, 151(4546), w30092. https://doi.org/10.4414/SMW.2021.w30092