1 From INSERM, UMR 1141, Hôpital Robert Debré, Paris, France (V.D.); the Department of Anesthesia and Perioperative Care, Hopital Pitié Salpetrière, Université Pierre et Marie Curie, Paris VI, Assistance Publique des Hopitaux de Paris, Paris, France (V.D.); and the Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University, Stanford, California (P.F.).