[1] NCI, Canc Therapeut Branch, CCR, NIH, Bethesda, MD 20892 USA
[2] NCI, MOCRU, CCR, NIH, Bethesda, MD 20892 USA
[3] NIH, Dept Radiol, Ctr Clin, Bethesda, MD 20892 USA
[4] NCI, Mol Imaging Program, NIH, Bethesda, MD 20892 USA
[5] NCI, Biostat & Data Management Sect, NIH, Bethesda, MD 20892 USA
[6] NCI, Mol Imaging Program, NIH, Bethesda, MD 20892 USA