1. Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
2. Department of Biomedical Engineering, The George Washington University, Washington, DC 20052, USA.
3. Vascular Biology Program and Department of Surgery, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USA.
4. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
5. New England Center for Stroke Research, Department of Radiology, University of Massachusetts, Worcester, MA 01655, USA.
6. Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
7. Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA.