1. University of Michigan, Department of Mechanical Engineering, Ann Arbor, Michigan, United States
2. University of Michigan, Division of Integrative Systems and Design, Ann Arbor, Michigan, United States
3. University of Michigan, Department of Internal Medicine, Division of Gastroenterology, Ann Arbor, Michigan, United States
4. University of Michigan, Department of Electrical and Computer Engineering, Ann Arbor, Michigan, United States
5. University of Michigan, Department of Biomedical Engineering, Ann Arbor, Michigan, United States