Severity of SARS-CoV-2 infection in a hospital population: a clinical comparison across age groups.

"Declarations Ethics approval and consent to participateThe study was approved by the ethics committee of the two participating hospitals, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico in Milan and Bambino Gesù Children's Hospital in Rome.All methods were performed in accordance with the ethical standards as laid down in the Declaration of Helsinki and its later amendments or comparable ethical standards.Written informed consent was obtained from all participants older than 18 years of age or from a parent and/or legal guardian in case of participants under 18. Consent for publicationNot applicable. Competing interestsNone to disclose. Competing interests None to disclose."

"Funding This work was supported by the Italian Institute of Health (COVID-2020–12371781)."