[1] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[2] Grp Hosp Pitie Salpetriere, AP HP, F-75634 Paris, France
[3] Hop Europeen Georges Pompidou, Paris, France
[4] Lab Imagerie Fonct, Paris, France
[5] Grp Hosp Pitie Salpetriere, AP HP, Dept Anesthesie Reanimat, F-75634 Paris, France