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Mayo Clinic
National Institutes of Health
Neurology | May 13, 2012 | Volume: 49 | Issue: 3 | Pages: 862-869
10.1212/wnl.49.3.862
Neurology | May 13, 2012 | Volume: 48 | Issue: 5 | Pages: 1446-1448
10.1212/wnl.48.5.1446