Funding for this research was provided by:
Instituto de Salud Carlos III (#COV20/00027)
Universidad de Alcalá (#COVID-19 UAH 2019/00003/016/001/028)
Fundación para la Investigación Biomédica del Hospital Universitario Principe de Asturias
Received: 31 January 2021
Accepted: 27 April 2021
First Online: 12 May 2021
: The present study was an extension of a previous study approved by the Ethics Research Committee of the University Hospital “Príncipe de Asturias” on March 18, 2020 (#SRAA-COVID19), including a waiver for the informed consent [CitationRef removed]. The Ethics Research Committee was informed of this extension, and no additional ethical assessment was required. Data extracted were fully anonymised and no attempt was made to interview patients or relatives. The study complied with the provisions of the European and Spanish legislation: Order SAS/3470/2009, December 16 and Regulation (EU) 2016/679 of the European Parliament and of the Council of 27 April 2016.
: Not applicable.
: The authors declare that they have no competing interests.