1. Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan.
2. Department of Anesthesiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, the Netherlands.
3. Department of Surgical Gastroenterology, Copenhagen University Hospital, Copenhagen, Denmark.
4. DNA Sequencing Core, University of Michigan, Ann Arbor, Michigan.
5. Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, the Netherlands.