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Mayo Clinic
University of Rochester
Neurology | March 30, 2012 | Volume: 78 | Issue: 15 | Pages: 1146-1149
10.1212/wnl.0b013e31824f8056
Neurology | June 14, 2011 | Volume: 64 | Issue: 2 | Pages: 208-215
10.1212/01.wnl.0000149403.14458.7f