Cornell University, Ithaca, NY 14850, USA Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA.|Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA.|Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA Computational and Systems Biology Initiative, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA.|Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA.|Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA Computational and Systems Biology Initiative, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA The Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA.