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Mayo Clinic
Oregon Health & Science University
JAMA Neurology | December 22, 2014 | Volume: 72 | Issue: 2 | Pages: 209
10.1001/jamaneurol.2014.2157
Neurology | April 27, 2012 | Volume: 78 | Issue: 19 | Pages: 1464-1471
10.1212/wnl.0b013e3182553c48