1 Molecular Neurotherapy and Imaging Laboratory (JMQ, KS), Department of Radiology (JMQ, KS), and Department of Neurology (KS), Massachusetts General Hospital, Harvard Medical School, Boston, MA; Harvard Stem Cell Institute, Harvard University, Cambridge, MA (KS).
2 Molecular Neurotherapy and Imaging Laboratory (JMQ, KS), Department of Radiology (JMQ, KS), and Department of Neurology (KS), Massachusetts General Hospital, Harvard Medical School, Boston, MA; Harvard Stem Cell Institute, Harvard University, Cambridge, MA (KS). kshah@mgh.harvard.edu.