1. Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA.
2. Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA.
3. Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, Michigan, USA.
4. Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA.
5. Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA.
6. Department of Biostatistics, and University of Michigan, Ann Arbor, Michigan, USA.
7. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan, USA.