1 Surgical critical care unit, department of anaesthesiology and critical care, CHU de Lille, Univ-Lille, F-59000 Lille, France. Electronic address: eric.kipnis@chru-lille.fr.
2 Department of anaesthesia and intensive care, hôpital Nord, Aix-Marseille université, AP-HM, chemin des Bourrely, 13015 Marseille, France.