COVID-19: Hotspot hospital? - Epidemiological analysis of time-delayed infection status determinations using antibody testing among staff at a peripheral primary and standard care hospital https://drks.de/register/de/trial/DRKS00022941/preview

COVID-19 infection incidence in hospitals in the first year of the pandemic - retrospective analysis of SARS- CoV-2-positive patients and staff in 2 peripheral hospitals in North Rhine-Westphalia https://drks.de/register/de/trial/DRKS00025865/preview