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Mayo Clinic
Mayo Clinic in Arizona
Circulation | June 12, 2012 | Volume: 102 | Issue: 9 | Pages: No page available
10.1161/01.cir.102.9.e52
Circulation | September 28, 2007 | Volume: 104 | Issue: 13 | Pages: No page available
10.1161/hc3801.096179