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Mayo Clinic
Emory University
Neurology | February 9, 2012 | Volume: 78 | Issue: 10 | Pages: 690-695
10.1212/wnl.0b013e318249f683
Neurology | January 18, 2010 | Volume: 74 | Issue: 3 | Pages: 229-238
10.1212/wnl.0b013e3181ca00ca