1. Department of Neurology Tianjin Huan Hu Hospital Tianjin Key Laboratory of Cerebrovascular and Neurodegenerative Diseases Tianjin China
2. Smell and Taste Center Perelman School of Medicine University of Pennsylvania Philadelphia PA USA
3. Department of Gerontology The No. 2 Hospital of Baoding Baoding China
4. Department of Neurology Hebei Petro China Central Hospital Langfang China
5. Department of Neurology Tianjin Medical University General Hospital Tianjin China
6. Peking University Clinical Research Institute Peking University First Hospital Beijing China