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Mayo Clinic
University of California, San Francisco
Neurology | June 8, 2009 | Volume: 72 | Issue: 23 | Pages: 2024-2028
10.1212/wnl.0b013e3181a92c4c
Neurology | September 6, 2007 | Volume: 70 | Issue: 16_part_2 | Pages: 1377-1383
10.1212/01.wnl.0000275527.35752.c5
Neurology | October 24, 2006 | Volume: 67 | Issue: 8 | Pages: 1506-1508
10.1212/01.wnl.0000240220.33950.0c