1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
2. Athinoula A. Martinos Center for Biomedical Imaging, Institute for Innovation in Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129
3. Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
4. Collagen Medical, Boston, MA 02478
5. Division of Gastrointestinal and Oncological Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114