From the Anaesthesiology Department of Lariboissiere Hospital, Paris (KE, RG, CP, JC, CT) and Anaesthesiology Department of Toulouse University Hospital, Toulouse, France (AG)

Correspondence to Dr Anna Gaubert, Département d’anesthésie reanimation, Hopital Purpan, Place Baylac, 31300 Toulouse, France. E-mail: [email protected]