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Mayo Clinic
Annals of Internal Medicine | August 6, 2013 | Volume: 159 | Issue: 3 | Pages: 169-175
10.7326/0003-4819-159-3-201308060-00006
Alimentary Pharmacology & Therapeutics | March 5, 2013 | Volume: 37 | Issue: 7 | Pages: 762-763
10.1111/apt.12243