. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Gastroenterology. 2011 Mar 17;140(5):1464–1471.e1. doi: 10.1053/j.gastro.2011.01.049
© 2011 The American Gastroenterological Association. Published by Elsevier Inc. All
rights reserved.