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Mayo Clinic
Neurology | November 23, 2009 | Volume: 73 | Issue: 21 | Pages: 1752-1758
10.1212/wnl.0b013e3181c34af5
Neurology | October 26, 2009 | Volume: 73 | Issue: 17 | Pages: 1381-1387
10.1212/wnl.0b013e3181bd80c1