1. VA Bedford Healthcare System, Medical Research & Development Service, Bedford, MA, USA
2. VA Boston Healthcare System, Neurology Service, Boston, MA, USA
3. Boston University School of Medicine, Alzheimer’s Disease Center, and Chronic Traumatic Encephalopathy Center, Boston, MA, USA
4. Boston University School of Medicine, Department of Pathology and Laboratory Medicine, and Department of Neurology, Boston, MA, USA