. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Clin Gastroenterol Hepatol. 2013 Jul 12;11(12):1562–70.e1-2. doi: 10.1016/j.cgh.2013.06.017
© 2013 The American Gastroenterological Association.
Published by Elsevier Inc. All rights reserved.