1. Department of Chemistry, Duke University, Durham, NC, USA
2. Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, USA
3. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
4. Department of Ophthalmology, Duke University Medical Center, Durham, NC, USA
5. Department of Ophthalmology, Stanford University Medical Center, Palo Alto, CA, USA
6. Department of Radiology, Duke University Medical Center, Durham, NC, USA
7. Duke University, Departments of Physics, Durham, NC, USA