[1] Virginia Mason Med Ctr, Dept Anesthesiol, Seattle, WA 98101 USA
[2] Virginia Mason Med Ctr, Dept Neurol, Seattle, WA 98101 USA
[3] Univ Melbourne, Melbourne, Vic, Australia
[4] Univ Toronto, Toronto, ON, Canada
[5] Ziekenhuis Oost Limburg, Genk, Belgium
[6] Mayo Clin, Coll Med, Rochester, MN USA
[7] Vanderbilt Univ Sch Med, Nashville, TN USA
[8] Harvard Univ, Sch Med, Boston, MA USA