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Mayo Clinic
University of Pennsylvania
Neurology | June 18, 2015 | Volume: 85 | Issue: 2 | Pages: 144-153
10.1212/wnl.0000000000001738
Neurology | September 13, 2012 | Volume: 79 | Issue: 13 | Pages: 1349-1355
10.1212/wnl.0b013e31826c1b9d
Neurology | September 15, 2011 | Volume: 77 | Issue: 13 | Pages: 1263-1271
10.1212/wnl.0b013e318230a16c