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Mayo Clinic
University of Southern California
Neurology | April 27, 2012 | Volume: 78 | Issue: 19 | Pages: 1464-1471
10.1212/wnl.0b013e3182553c48
Neurology | May 29, 2008 | Volume: 71 | Issue: 2 | Pages: 85-92
10.1212/01.wnl.0000303973.71803.81