1. Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin, China.
2. Tianjin Neurological Institute, Neurology, Key Laboratory of Post Neurotrauma Neurorepair and Regeneration in Central Nervous System, Ministry of Education and Tianjin City, Tianjin, China.
3. Department of Neurology, Henry Ford Hospital, Detroit, Michigan.
4. Department of Physics, Oakland University, Rochester, Michigan.
5. Department of Public Health Sciences, Henry Ford Hospital, Detroit, Michigan.