Ferreira Lincoln E V V C, Topazian Mark D, Baron Todd H
Department of Medicine, Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, Minnesota, USA.
Clin Gastroenterol Hepatol. 2008 Mar;6(3):e15. doi: 10.1016/j.cgh.2007.12.055. Epub 2008 Feb 6.