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Mayo Clinic
Neurology | May 13, 2012 | Volume: 51 | Issue: 5 | Pages: 1342-1352
10.1212/wnl.51.5.1342
Neurology | May 13, 2012 | Volume: 59 | Issue: 10 | Pages: 1496-1506
10.1212/01.wnl.0000034080.43681.da