[1] Image Anal Ctr, Basel, Switzerland
[2] Univ Hosp Basel, Neurol, Neurology, Netherlands
[3] Univ Penn, Philadelphia, PA 19104 USA
[4] Univ British Columbia, Vancouver, BC, Canada
[5] F Hoffmann La Roche Ltd, Basel, Switzerland
[6] Genentech Inc, Neurosci, US Med Affairs, South San Francisco, CA USA
[7] F Hoffman La Roche Ltd, Basel, Switzerland
[8] Univ Calif San Francisco, Dept Neurol, San Francisco, CA USA