1 Department of Anesthesia and Intensive Care Medicine, Liege University Hospital, Liege, Belgium, mcarella@chuliege.be.
2 Department of Anesthesia and Intensive Care Medicine, Liege University Hospital, Liege, Belgium, University Department of Anesthesia and Intensive Care Medicine, Centre Hospitalier Regional de la Citadelle, Liege, Belgium, Anesthesia and Intensive Care Laboratory, GIGA-Consciousness Thematic Unit, GIGA-Research, Liege University, Liege, Belgium.
3 Department of Anesthesia and Intensive Care Medicine, Liege University Hospital, Liege, Belgium.