1. Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, District of Columbia 20057, United States
2. Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Medical Center, Washington, District of Columbia 20057, United States
3. Center for Metabolomic Studies, Georgetown University, Washington, District of Columbia 20057, United States
4. Department of Radiation Medicine, Georgetown University Hospital, Washington, District of Columbia 20057, United States
5. Radiological Research Accelerator Facility, Columbia University, Irvington, New York 10533, United States
6. Center for Radiological Research, Columbia University Irving Medical Center, New York, New York 10032, United States