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Mayo Clinic
NewYork–Presbyterian Hospital
Annals of Internal Medicine | April 12, 2013 | Volume: 139 | Issue: 7 | Pages: 603
10.7326/0003-4819-139-7-200310070-00024
Annals of Internal Medicine | April 12, 2013 | Volume: 137 | Issue: 10 | Pages: 814-822
10.7326/0003-4819-137-10-200211190-00010