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Mayo Clinic
Goethe University Frankfurt
Movement Disorders | August 2, 2013 | Volume: 28 | Issue: 12 | Pages: 1740-1744
10.1002/mds.25600
Neurology | July 12, 2012 | Volume: 79 | Issue: 7 | Pages: 659-667
10.1212/wnl.0b013e318264e353