[1] Univ Calif San Francisco, San Francisco, CA 94143 USA
[2] Univ Basel, Univ Basel Hosp, Basel, Switzerland
[3] Univ Toronto, Div Neurol, Toronto, ON, Canada
[4] Univ Penn, Philadelphia, PA 19104 USA
[5] Queen Mary Univ London, London, England
[6] F Hoffmann La Roche Ltd, Basel, Switzerland
[7] Genentech Inc, San Francisco, CA 94080 USA
[8] Univ Texas Hlth Sci Ctr Houston UTHlth, McGovern Med Sch, Houston, TX USA