1. Department of Molecular Medicine and Department of Neuroscience, The Scripps Research Institute, La Jolla, California 92037, United States
2. Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts 02129, United States
3. American Chemical Society, 1155 16th Street NW, Washington, D.C. 20036, United States
4. Department of Radiology, Harvard Medical School, Boston, Massachusetts 02115, United States