3. According to DSM-IV, the diagnostic standard of dementia was not met.
4. The clinical dementia rating (CDR) was 0.5.
You may not be if
1. Subjects with mental retardation.
2. Refuse to have blood sampling, imaging and other examinations.
3. Uncooperative subjects that have serious organic diseases, or have a history of mental illness, or have physical disability (including severe aphasia).
4. Contraindications of MR scanning.
5. Suffering from serious physical or mental illness.
