1. GE Healthcare, Waukesha, WI.
2. Department of Radiology, Division of Nuclear Medicine and Molecular Imaging, Stanford University, 300 Pasteur Dr, H2200, Stanford, CA 94305.
3. Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA.
4. Department of Radiology, PET-MRI Research Program, Stanford University, Stanford, CA.