1. Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON L8S 4L8, Canada.
2. DKF (Department of Clinical Research), Maurice Müller Laboratories, Universitätsklinik für Viszerale Chirurgie und Medizin (UVCM), University of Bern, 3008 Bern, Switzerland.
3. Institute of Microbiology, ETH Zürich, 8032 Zürich, Switzerland.
4. Department of Genetics, The Scripps Research Institute, La Jolla, CA 92121, USA.
5. Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA.