Corrigendum: Diabetes as a risk factor of death in hospitalized COVID-19 patients – an analysis of a National Hospitalization Database from Poland, 2020 - Kania, Michal; Koń, Beata; Kamiński, Konrad; Hohendorff, Jerzy; Witek, Przemysław; Klupa, Tomasz; Malecki, Maciej T. (Frontiers in Endocrinology, 2023)