Harrison's Gastroenterology and Hepatology
Editors:Dan L. Longo, MDScientific Director, National Institute on AgingNational Institutes of HealthBethesda and Baltimore, MDAnthony S. Fauci, MDChief, Laboratory of ImmunoregulationDirector, National Institute of Allergy and Infectious DiseasesNational Institutes of HealthBethesda, MDAssociate Editor:Carol A. Langford, MD, MHSAssociate Professor of MedicineCleveland ClinicCleveland, OH