[1] Northern Care Alliance, Manchester Acad Hlth Sci Ctr, Geoffrey Jefferson Brain Res Ctr, Manchester, England
[2] Univ Manchester, Manchester, England
[3] Uppsala Univ, Uppsala Univ Hosp, Dept Med Sci, Emergency Dept, Uppsala, Sweden
[4] Univ Cincinnati, Coll Med, Dept Emergency Med, Cincinnati, OH USA
[5] Univ Brescia, Dept Clin & Expt Sci, Neurol Unit, Brescia, Italy
[6] Univ Roma La Sapienza, Emergency Dept Stroke Unit, Policlin Umberto I, Rome, Italy
[7] Univ Hosp, Dept Neurol, Inselspital, Bern, Switzerland
[8] Univ Bern, Bern, Switzerland
[9] Newcastle Univ, Neurosurg Trials Grp, Newcastle Upon Tyne, England
[10] Elisabeth TweeSteden Hosp, Dept Neurosurg, Tilburg, Netherlands
[11] Radboud Univ Nijmegen, Med Ctr, Donders Inst Brain Cognit & Behav, Dept Neurol, Nijmegen, Netherlands
[12] Klinikum Frankfurt Hochst, Dept Neurol, Frankfurt, Germany
[13] Heidelberg Univ Hosp, Heidelberg, Germany
[14] Massachusetts Gen Hosp, Dept Emergency Med, Boston, MA USA
[15] Salford Royal Hosp, Stott Lane, Salford M6 8HD, England