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Mayo Clinic
Annals of Internal Medicine | April 12, 2013 | Volume: 75 | Issue: 4 | Pages: 640-642
10.7326/0003-4819-75-4-640
Annals of Internal Medicine | April 12, 2013 | Volume: 74 | Issue: 2 | Pages: 292-293
10.7326/0003-4819-74-2-292