[1] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Anesthesiol,Lab Nanomed & Biomat, Boston, MA 02115 USA
[2] MIT, Dept Chem Engn, Cambridge, MA 02139 USA
[3] MIT, Div Hlth Sci & Technol, Cambridge, MA 02139 USA
[4] MIT, Dept Biol, Cambridge, MA USA
[5] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Radiat Oncol, Boston, MA 02115 USA