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Mayo Clinic
Annals of Internal Medicine | April 12, 2013 | Volume: 128 | Issue: 5 | Pages: 410
10.7326/0003-4819-128-5-199803010-00016
Annals of Internal Medicine | April 12, 2013 | Volume: 120 | Issue: 12 | Pages: 987-992
10.7326/0003-4819-120-12-199406150-00003