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Mayo Clinic
Neurology | May 13, 2012 | Volume: 51 | Issue: 6 | Pages: 1672-1677
10.1212/wnl.51.6.1672
Neurology | May 13, 2012 | Volume: 48 | Issue: 5 | Pages: 1356-1362
10.1212/wnl.48.5.1356
Neurology | May 13, 2012 | Volume: 45 | Issue: 7 | Pages: 1340-1344
10.1212/wnl.45.7.1340