1. School of General Practice and Continuing Education, Capital Medical University, Fengtai, No. 10, You An Men Wai Xi Tou Tiao, Beijing 100069, China
2. Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
3. Research Center of Gerontology and Longevity, Affiliated Hospital of Nantong University, Nantong, China
4. Department of Neurosurgery, Wayne State University School of Medicine, Detroit, USA
5. Department of General Practice, Beijing Tiantan Hospital, Capital Medical University, Beijing, China