1. Division of Radiation Health, Department of Pharmaceutical Sciences and Winthrop P. Rockefeller Cancer Institute, University of Arkansas for Medical Sciences, Little Rock, AR;
2. Institute of Radiation Medicine, Peking Union Medical College & Chinese Academy of Medical Sciences (PUMC & CAMS), Tianjin, China;
3. Department of Pathology, Medical University of South Carolina, Charleston, SC; and
4. Department of Medicine and Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC