1. GSK Center for Optical Molecular Imaging, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
2. Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
3. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
4. In vitro/In vivo Translation, Research, GSK, Collegeville, Pennsylvania 19426, United States
5. In vitro/In vivo Translation, Research, GSK, Stevenage SG1 2NY, U.K.
6. Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
7. Carle Illinois College of Medicine, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States