Lucijanić, Marko; Piskač Živković, Nevenka; Režić, Tanja; Durlen, Ivan; Stojić, Josip; Jurin, Ivana; Šakota, Sara; Filipović, Dora; Kurjaković, Iva; Jordan, Ana; Bušić, Nikolina; Pavić, Josipa; Lukšić, Ivica; Baršić, Bruno: The performance of the WHO COVID-19 severity classification, COVID-GRAM, VACO Index, 4C Mortality, and CURB-65 prognostic scores in hospitalized COVID-19 patients: data on 4014 patients from a tertiary center registry