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Mayo Clinic
Annals of Internal Medicine | April 12, 2013 | Volume: 5 | Issue: 2 | Pages: 201-211
10.7326/0003-4819-5-2-201
Annals of Internal Medicine | April 11, 2013 | Volume: 1 | Issue: 8 | Pages: 558-562
10.7326/0003-4819-1-8-558