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Mayo Clinic
Pfizer (United States)
Neurology | May 13, 2012 | Volume: 54 | Issue: 9 | Pages: 1734-1741
10.1212/wnl.54.9.1734
Neurology | May 13, 2012 | Volume: 54 | Issue: 9 | Pages: 1726-1733
10.1212/wnl.54.9.1726