. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Gastrointest Endosc. 2009 Jun 25;70(4):645–654. doi: 10.1016/j.gie.2009.02.009
© 2009 American Society for Gastrointestinal Endoscopy. Published by Mosby, Inc. All rights reserved.