Neurophysicist. Xu Yuan, deputy chief physician of Department of Neurology, Ninth People's Hospital of Zhengzhou City, Henan Province, specializes in the diagnosis and treatment of massive cerebral infarction complicated with hyponatremia. Because of her sweet appearance, she always wears a signature smile to patients, and people often call her Dr. Yan. Xu Yuan is attending Alzheimer's disease. Alzheimer's Harmo's disease, commonly known as Alzheimer's Harmo's disease, is a neurodegenerative disease. Patients may have memory loss, language disorder, slow response, disorientation, abnormal mental behavior and so on.