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Mayo Clinic
University of Pennsylvania
Neurology | March 30, 2012 | Volume: 78 | Issue: 15 | Pages: 1146-1149
10.1212/wnl.0b013e31824f8056
Neurology | February 9, 2012 | Volume: 78 | Issue: 10 | Pages: 690-695
10.1212/wnl.0b013e318249f683