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Mayo Clinic
Neurology | January 12, 2017 | Volume: 88 | Issue: 6 | Pages: 562-568
10.1212/wnl.0000000000003597
JAMA Neurology | December 31, 2015 | Volume: 73 | Issue: 2 | Pages: 213
10.1001/jamaneurol.2015.3943