Clinical Severity of SARS-CoV-2 Omicron Variant Compared with Delta among Hospitalized COVID-19 Patients in Belgium during Autumn and Winter Season 2021-2022., Van Goethem, Nina, Chung Pui Yan Jenny, Meurisse Marjan, Vandromme Mathil, De Mot Laurane, Brondeel Ruben, Stouten Veerle, Klamer Sofieke, Cuypers Lize, Braeye Toon, et al. , Viruses, 2022 Jun 14, Volume 14, Issue 6, (2022)