1. Department of Neuropsychiatry, National Institute of Neurology and Neurosurgery, Mexico City, México
2. Department of Neurology, National Institute of Neurology and Neurosurgery, Mexico City, México
3. Molecular Imaging PET/CT Unit, National Institute of Neurology and Neurosurgery, Mexico City, México
4. Ronald Reagan UCLA Medical Center, Los Angeles, CA, USA