1. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
2. Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA.
3. Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
4. Division of Gastroenterology, Department of Medicine and Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
5. Department of Biomedical Informatics, Harvard Medical School, Boston, MA 02115, USA.