1. Department of Microbiology and Physiological Systems, University of Massachusetts, Medical School, Worcester, MA, USA
2. Department of Pathology, University of Massachusetts, Medical School, Worcester, MA, USA
3. Statens Serum Institut, Copenhagen, Denmark
4. Gastrointestinal Unit and Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
5. Naval Medical Research Unit Dayton, Wright-Patterson Air Force Base, Dayton, OH, USA
6. MatTek Corporation, Ashland, MA, USA