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Mayo Clinic
Ohio University
Neurology | March 1, 2012 | Volume: 78 | Issue: 13 | Pages: 976-984
10.1212/wnl.0b013e31824d5846
Neurology | August 27, 2007 | Volume: 69 | Issue: 9 | Pages: 821-826
10.1212/01.wnl.0000267886.85210.37