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Mayo Clinic
University of Minnesota
Circulation | June 12, 2012 | Volume: 102 | Issue: 11 | Pages: 1216-1220
10.1161/01.cir.102.11.1216
Neurology | May 13, 2012 | Volume: 60 | Issue: 10 | Pages: 1690-1692
10.1212/01.wnl.0000065881.46964.4f