Elevated level of serum human epididymis protein 4 (HE4) predicts disease severity and mortality in COVID-19 pneumonia.

"Declarations Ethics approval and consent to participateThe study was approved by the Scientific and Research Ethics Committee of the University of Debrecen and the Ministry of Human Capacities (32568–7/2020/EÜIG). Written informed consent was obtained from all participants. All experiments were performed in accordance with relevant guidelines and regulations and with the Declaration of Helsinki. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was supported by the National Research, Development, and Innovation Fund (FK135327 to BN), by the Hungarian Academy of Sciences (POST-COVID2021-33 grant) and by the ÚNKP-22-3-I-DE-370 grant to MP and ÚNKP-22-4-II-DE-120 grant to ZF."