Swiss Medical Weekly. Erratum to: High SARS-CoV-2 seroprevalence but no severe course of COVID-19 disease among people on opioid agonist treatment in Zurich: a cross-sectional study: Erratum to Swiss Med Wkly. 2022;152:w30122 (DOI 10.4414/smw.2022.w30122). Swiss Med Wkly [Internet]. 2022 Feb. 1 [cited 2024 Apr. 20];152(0506):w30149. Available from: https://smw.ch/index.php/smw/article/view/3155