1. Laboratory of Molecular Imaging and Nanomedicine (LOMIN) National Institute of Biomedical Imaging and Bioengineering (NIBIB) National Institutes of Health (NIH) Bethesda MD 20892 USA
2. Department of Chemistry University of Georgia Athens GA 30602 USA
3. Laboratory of Cellular Imaging and Macfromolecular Biophysics National Institute of Biomedical Imaging and Bioengineering (NIBIB) National Institutes of Health (NIH) Bethesda MD 20892 USA