Figure 4. Process from normal status to post-stroke status. (A) normal status when a person is healthy and has no chronic disease; (B) status when a person suffers from diseases that are risk factors of stroke, including hypertension, atrial fibrillation and so on; (C) stroke-prone status when outside attacks such as infection and alcohol can trigger stroke onset in a person with risk factors of stroke; (D) post-stroke status when a person has suffered from stroke onset.