Authors: Geir Hoff; Moritz Volker; Michael Bretthauer; Lars Aabakken; Ole Høie; Thomas Delange; Ingrid Berset; Øystein Kjellevold; Tom Glomsaker; Gert Huppertz-Hauss; Ove Lange; Per Sandvei Journal: BMC Gastroenterol Date: 2011-06-14 Impact factor: 3.067