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Mayo Clinic
Neurology | May 19, 2011 | Volume: 77 | Issue: 1 | Pages: 26-34
10.1212/wnl.0b013e31822313dc
Neurology | May 31, 2010 | Volume: 74 | Issue: 22 | Pages: 1814-1821
10.1212/wnl.0b013e3181e0f7cf