1. NeuroGrow Brain Fitness Center, McLean, VA, USA
2. Johns Hopkins Medicine, Baltimore, MD, USA
3. Neuroradiology Section, Mallinckrodt Institute of Radiology at Washington University in St. Louis, St. Louis, MO, USA
4. Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
5. Department of Neurology, Washington University in St. Louis, St. Louis, MO, USA