aIntensive Care and Anesthesiology Department, Saint Eloi Hospital, Montpellier University Hospital, 80, Avenue Augustin Fliche, 34295 Montpellier Cedex 5, FrancebPain Clinic, Intensive Care and Anesthesiology Department, Carémeau Hospital, Nîmes University Hospital, Place Professeur Robert Debré, 30029 Nîmes Cedex 9, FrancecNational Institute of Health and Medical Research (INSERM) ERI 25/EA 4202, Montpellier University 1, 371 Avenue du Doyen Gaston Giraud, Arnaud de Villeneuve Hospital, 34295 Montpellier Cedex 5, FrancedGeneral Intensive Care Unit, Hotel-Dieu Hospital, Clermont-Ferrand University Hospital, Clermont-Ferrand, France