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Mayo Clinic
Neurology | May 13, 2012 | Volume: 56 | Issue: 11 | Pages: 1514-1522
10.1212/wnl.56.11.1514
Neurology | May 13, 2012 | Volume: 49 | Issue: 5 | Pages: 1413-1418
10.1212/wnl.49.5.1413
Neurology | May 13, 2012 | Volume: 45 | Issue: 2 | Pages: 244-250
10.1212/wnl.45.2.244