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A5067098327 | I1330342723
Mayo Clinic
Neurology | May 13, 2012 | Volume: 50 | Issue: 1 | Pages: 208-216
10.1212/wnl.50.1.208 | PMID 9443482
Neurology | October 19, 2009 | Volume: 73 | Issue: 16 | Pages: 1308-1312
10.1212/wnl.0b013e3181bd136b | PMID 19841383