Received: 26 February 2018
Accepted: 9 May 2018
First Online: 30 May 2018
Ethics approval and consent to participate
: The ENVIN registry was approved by the ethics committees of the majority of participating ICUs, including our hospital, and was declared a registry of healthcare interest by the Spanish Ministry of Health, Social Services and Equality in 2014.
: Not applicable, given the noninterventional nature of the study, because data were collected from the ENVIN-HELICS registry.
: The authors declare that they have no competing interests.
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