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Mayo Clinic
Annals of Internal Medicine | April 11, 2013 | Volume: 4 | Issue: 3 | Pages: 217-221
10.7326/0003-4819-4-3-217
Neurology | May 13, 2012 | Volume: 3 | Issue: 1 | Pages: 01-01
10.1212/wnl.3.1.01