Funding for this research was provided by:
National Natural Science Foundation of China (61772560)
Natural Science Foundation of Hunan Province (2019JJ40388)
Fundamental Research Funds for the Central Universities of Central South University (1053320191221)
Received: 24 August 2020
Accepted: 28 January 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: Ethical consent was not required in this study, since the MIMIC-III data were analyzed namelessly.
: The manuscript does not include individual person’s data.
: The authors declare that they have no competing interests.