AUTHOR=Hu Yaohua , Lu You , Dong Jiagui , Xia Delin , Li Jin , Wang Hong , Rao Min , Wang Chenxing , Tong Wanning TITLE=Epidemiological and clinical characteristics of COVID-19 mortality: a retrospective study JOURNAL=Frontiers in Medicine VOLUME=12 YEAR=2025 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2025.1464274 DOI=10.3389/fmed.2025.1464274 ISSN=2296-858X