Obando Jorge, Merkle Elmar, Bean Sarah M
Department of Medicine, Division of Gastroenterology, Duke University Medical Center, Durham, North Carolina, USA.
Clin Gastroenterol Hepatol. 2009 Aug;7(8):A24-e1. doi: 10.1016/j.cgh.2008.11.011. Epub 2008 Nov 21.