1. Gastrointestinal Unit, Department of MedicineMassachusetts General Hospital, Harvard Medical SchoolBoston MA
2. Clinical and Translational Unit, Department of MedicineMassachusetts General Hospital, Harvard Medical SchoolBoston MA
3. Obesity, Metabolism, and Nutrition InstituteMassachusetts General Hospital, Harvard Medical SchoolBoston MA
4. Pathology Unit, Massachusetts General HospitalHarvard Medical SchoolBoston MA
5. Massachusetts Institute of TechnologyCambridge MA
6. Center for Engineering in Medicine, Shriner's HospitalHarvard Medical SchoolBoston MA