AUTHOR=Siniscalchi Carmine , Ticinesi Andrea , Guerra Angela , Parise Alberto , Cerundolo Nicoletta , Prati Beatrice , Simoni Riccardo , Porro Emanuela , Meschi Tiziana 

TITLE=The prognostic value of Clinical Frailty Scale in COVID-19 pneumonia across different pandemic phases: a comparison between the first and the fourth wave

JOURNAL=Frontiers in Medicine

VOLUME=12

YEAR=2025

URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2025.1549444

DOI=10.3389/fmed.2025.1549444

ISSN=2296-858X