Authors: Brian C Healy; Eman N Ali; Charles R G Guttmann; Tanuja Chitnis; Bonnie I Glanz; Guy Buckle; Maria Houtchens; Lynn Stazzone; Jennifer Moodie; Annika M Berger; Yang Duan; Rohit Bakshi; Samia Khoury; Howard Weiner; Alberto Ascherio Journal: Arch Neurol Date: 2009-07