1. John A. Paulson School of Engineering and Applied SciencesHarvard University Cambridge MA 02138 USA
2. Wyss Institute for Biologically Inspired Engineering at Harvard University Boston MA 02115 USA
3. Department of Civil and Environmental EngineeringSyracuse University Syracuse NY 13244 USA
4. Department of Biomedical Engineering and BiotechnologyUniversity of Massachusetts Lowell Lowell MA 01854 USA
5. Vascular Biology Program and Department of SurgeryBoston Children's Hospital and Harvard Medical School Boston MA 02115 USA