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 2022, 152 (0506), w30149. https://doi.org/10.4414/SMW.2022.w30149.