[1] Univ Glasgow, Inst Cardiovasc Sci, Glasgow, Lanark, Scotland
[2] Univ Glasgow, Inst Med Sci, Glasgow, Lanark, Scotland
[3] Univ Nottingham, Div Stroke Med, Nottingham NG7 2RD, England
[4] Univ Washington, Dept Pharm, Seattle, WA 98195 USA
[5] Genentech Inc, San Francisco, CA 94080 USA