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Mayo Clinic
Annals of Internal Medicine | April 12, 2013 | Volume: 149 | Issue: 6 | Pages: 416-420
10.7326/0003-4819-149-6-200809160-00008
Annals of Internal Medicine | April 12, 2013 | Volume: 145 | Issue: 10 | Pages: 774-779
10.7326/0003-4819-145-10-200611210-00010