[1] Univ Zurich, Univ Zurich Hosp, Dept Gastroenterol & Hepatol, Zurich, Switzerland
[2] Univ Zurich, Univ Zurich Hosp, Dept Dermatol, Zurich, Switzerland
[3] Univ Basel, Univ Basel Hosp, Inst Med Genet & Pathol, Basel, Switzerland
[4] Univ Zurich, Univ Zurich Hosp, Dept Pathol & Mol Pathol, Zurich, Switzerland
[5] Univ Technol Dresden, Univ Hosp Dresden, Dept Med 1, Dresden, Germany
[6] Paracelsus Med Univ Salzburg, Gen Hosp Oberndorf, Teaching Hosp, Dept Internal Med, Salzburg, Austria
[7] Univ Hosp Rostock, Dept Gen Surg, Rostock, Germany
[8] German Canc Res Ctr, Dept Chron Inflammat & Canc, Heidelberg, Germany