1 Department of Medicine, Barnes-Jewish Hospital/Washington University in St. Louis, St. Louis, Missouri, USA.
2 Section of Colon and Rectal Surgery, Division of General Surgery, Barnes-Jewish Hospital/Washington University in St. Louis, St. Louis, Missouri, USA.
3 Department of Pathology and Immunology, Barnes-Jewish Hospital/Washington University in St. Louis, St. Louis, Missouri, USA.
4 Division of Gastroenterology & Hepatology, Department of Medicine, Barnes-Jewish Hospital/Washington University in St. Louis, St. Louis, Missouri, USA.