[1] Univ Oxford, Ctr Funct Magnet Resonance Imaging Brain, Oxford, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Comp, London, England
[3] GlaxoSmithKline Inc, Clin Imaging Ctr, London, England
[4] Oxford Ctr Clin Magnet Resonance Res, Dept Cardiovasc Med, Oxford, England
[5] Cardiff Univ, Brain & Repair Imaging Ctr, Cardiff, Wales
[6] Univ Wurzburg, Dept Neuroradiol, Wurzburg, Germany