1. Department of Biochemistry and Molecular and Cellular Biology, Georgetown University, Washington, DC
2. Department of Infectious Diseases, The Scripps Research Institute, Jupiter, Florida
3. Department of Electrical Engineering, Columbia University, New York, New York
4. Radiological Research Accelerator Facility, Columbia University, Irvington, New York
5. Center for Radiological Research, Columbia University, New York, New York