1. Center for Extreme Bionics, Massachusetts Institute of Technology (MIT) Media Lab, Cambridge, MA 02139, USA.
2. Harvard–MIT Division of Health Sciences and Technology, MIT, Cambridge, MA 02139, USA.
3. Division of Plastic and Reconstructive Surgery, Brigham and Women’s Hospital, Boston, MA 02115, USA.
4. Department of Media Arts and Sciences, MIT, Cambridge, MA 02139, USA.