Siersema Peter D, Hirdes Meike M C
Department of Gastroenterology & Hepatology, University Medical Center, Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands.
Nat Clin Pract Gastroenterol Hepatol. 2009 Mar;6(3):146-7. doi: 10.1038/ncpgasthep1364. Epub 2009 Feb 10.