1 Pole d'Anesthésie-Réanimation, Academic Hospital Lille, Lille, France, anne-sophie.ducloy@chru-lille.fr Pole d'Hématologie Transfusion, Academic Hospital Lille, Université Lille Nord de France, Lille, France Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois Department of Anesthesia, Stanford University School of Medicine, Stanford, California Transfusion Service, University of New Mexico, Albuquerque, New Mexico.