1. Department of Chemical Engineering and David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
2. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3. Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, USA.
4. Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
5. Global Research Technologies and Device R&D, Novo Nordisk A/S, Maaloev, Denmark.
6. Department of Micro and Nanosystems, KTH Royal Institute of Technology, Stockholm, Sweden.
7. Division of Gastroenterology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA.