1. Department of Neurology, Beijing Friendship Hospital Capital Medical University Beijing P. R. China
2. Department of Neurology, Xuan Wu Hospital Capital Medical University Beijing P. R. China
3. Center of Alzheimer's Disease of Beijing Institute for Brain Disorders Beijing P. R. China
4. Beijing Key Laboratory of Geriatric Cognitive Disorders Beijing P. R. China
5. Department of Computer Science University of Otago Dunedin New Zealand
6. Center for Evidence‐Based Medicine, Xuan Wu Hospital Capital Medical University Beijing P. R. China