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A5088462975 | I1330342723
Mayo Clinic
Neurology | May 13, 2012 | Volume: 51 | Issue: 3 | Pages: 742-747
10.1212/wnl.51.3.742 | PMID 9748020
Neurology | May 13, 2012 | Volume: 49 | Issue: 2 | Pages: 378-385
10.1212/wnl.49.2.378 | PMID 9270565