Paulsen J M, Aragon G C, Ali M A, Brody F J, Borum M L
Department of Internal Medicine, Division of Gastroenterology and Liver Diseases, George Washington University Medical Center, Washington, DC, USA.
Dig Dis Sci. 2010 Apr;55(4):1179-81. doi: 10.1007/s10620-009-0809-1. Epub 2009 May 7.