1. Department of Medicine, Division of Gastroenterology and the Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
2. Department of Molecular Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
3. Department of Genetics, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
4. Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
5. Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
6. Montreal Heart Institute, Montreal, Quebec H1T 1C8, Canada.
7. Université de Montréal, Montreal, Quebec H3C 3J7, Canada.
8. Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
9. Center for Microbiome Informatics and Therapeutics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.