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Mayo Clinic
Cleveland Clinic
JAMA Neurology | March 25, 2014 | Volume: 71 | Issue: 5 | Pages: 543
10.1001/jamaneurol.2014.131
Neurology | March 30, 2012 | Volume: 78 | Issue: 15 | Pages: 1146-1149
10.1212/wnl.0b013e31824f8056