[1] Washington Univ, Neurol Neurosurg Intens Care Unit, St Louis, MO 63130 USA
[2] Rush Med Coll, Chicago, IL 60612 USA
[3] Univ Calif San Francisco, San Francisco, CA 94143 USA
[4] Univ Cambridge, Cambridge, England
[5] Univ Cincinnati, Cincinnati, OH USA
[6] Univ Calif Los Angeles, Los Angeles, CA USA
[7] Univ Mediterrane, Marseille, France
[8] Columbia Univ, New York, NY USA
[9] San Gerardo Hosp, Monza, Italy
[10] Univ Virginia, Charlottesville, VA USA
[11] Univ Dusseldorf, Dusseldorf, Germany
[12] Univ Florida, Gainesville, FL USA
[13] Mayo Clin, Rochester, MN USA
[14] Univ Penn, Philadelphia, PA 19104 USA
[15] Univ Innsbruck Hosp, A-6020 Innsbruck, Austria
[16] Baylor Coll Med, Houston, TX 77030 USA
[17] Washington Univ, St Louis, MO USA
[18] Univ Nottingham Hosp, Nottingham NG7 2UH, England
[19] Univ Utrecht, Utrecht, Netherlands
[20] Free Univ Berlin, D-1000 Berlin, Germany
[21] Washington Univ, St Louis, MO USA