1. Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston 02114, Massachusetts, United States
2. Department of Radiology, Harvard Medical School, 75 Francis Street, Boston 02115, Massachusetts, United States
3. Pharma Research and Early Development, F. Hoffmann-La Roche Ltd, Basel CH-4070, Switzerland
4. Department of Neurology and the Massachusetts Alzheimer’s Disease Research Center, Massachusetts General Hospital, Harvard Medical School, 114 16th Street, Charlestown 02129, Massachusetts, United States