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Mayo Clinic
Annals of Internal Medicine | April 12, 2013 | Volume: 146 | Issue: 3 | Pages: 230
10.7326/0003-4819-146-3-200702060-00018
Annals of Internal Medicine | April 12, 2013 | Volume: 145 | Issue: 3 | Pages: 234-235
10.7326/0003-4819-145-3-200608010-00021