[1] CHU Angers, Dept Anestheesie Reanimat Chirurg 1, F-49033 Angers, France
[2] Hop Charles Nicolle, Serv Neurochirurg, F-76031 Rouen, France
[3] ULB, Erasme Univ Hosp, Serv Soins Intens, B-1070 Brussels, Belgium
[4] Serv Univ Anesthesie Reanimat, CHR Citadelle, B-4000 Liege, Belgium
[5] Hop Gui De Chauliac, Serv Neuroradiol, F-34295 Montpellier, France
[6] Grp Hosp Pitie Salpetriere, Unite Neuroanesthesie Reanimat, F-75651 Paris, France
[7] Hop Cent, Serv Anesthesie Reanimat Chirurg, F-54035 Nancy, France
[8] Hop Laennec, Serv Neuroradiol, F-44035 Nantes, France
[9] CHU Timone Adultes, Serv Anesthesie Reanimat, F-13385 Marseille, France
[10] Hop Pellegrin, Serv Anesthesie Reanimat, F-33076 Bordeaux, France
[11] Hop Sion, CH-1951 Sion, Switzerland
[12] CHU Vaudois, Anesthesiol Serv, CH-1011 Lausanne, Switzerland
[13] CHU Timone, Serv Neurochirurg, F-13385 Marseille, France
[14] Hop Charles Nicolle, Clin Neurochirurg, F-76031 Rouen, France
[15] Hop Gabriel Montpied, Serv Neuroradiol & Imagerie Med, F-63003 Clermont Ferrand, France