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Mayo Clinic
Dartmouth–Hitchcock Medical Center
Neurology | January 22, 2015 | Volume: 84 | Issue: 7 | Pages: 729-737
10.1212/wnl.0000000000001231
Neurology | April 5, 2012 | Volume: 78 | Issue: 18 | Pages: 1376-1382
10.1212/wnl.0b013e318253d5b3