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Mayo Clinic
University of Colorado Denver
JAMA | June 11, 2015 | Volume: 310 | Issue: 19 | Pages: 2069
10.1001/jama.2013.282043
JAMA | March 10, 2015 | Volume: 313 | Issue: 10 | Pages: 1019
10.1001/jama.2015.1474