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Mayo Clinic
Neurology | May 14, 2012 | Volume: 58 | Issue: 12 | Pages: 1739-1744
10.1212/wnl.58.12.1739
Neurology | May 13, 2012 | Volume: 61 | Issue: 4 | Pages: 576-577
10.1212/01.wnl.0000073541.08356.47