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Mayo Clinic
Neurology | July 20, 2012 | Volume: 79 | Issue: 5 | Pages: 482-483
10.1212/wnl.0b013e31826170f1
Neurology | December 22, 2010 | Volume: 76 | Issue: 5 | Pages: 467-474
10.1212/wnl.0b013e31820a0e3b