1. Center for Vital Longevity, School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas
2. Multimodal Neuroimaging Group, Department of Nuclear Medicine, University Hospital Cologne, Cologne, Germany
3. Institute of Neuroscience and Medicine (INM-3), Cognitive Neuroscience Research Center, Jülich, Germany
4. Rotman Research Institute, Baycrest Health Sciences, Toronto, Ontario, Canada
5. Avid Radiopharmaceuticals, a Wholly Owned Subsidiary of Eli Lilly, Philadelphia, Pennsylvania
6. Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas