1. Department
of Radiology, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
2. Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States
3. Department
of Chemistry and Biochemistry and Materials Technology Center, Southern Illinois University, Carbondale, Illinois 62901, United States
4. Department
of Biomedical Engineering, Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee 37232, United States
5. Russian Academy of Sciences, Leninskiy Prospekt 14, Moscow 119991, Russia