1. China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
2. Department of Obstetrics and Gynecology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
3. National Center for Healthcare Quality Management in Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
4. Department of Neurology, Beijing Tiantan Hospital, Beijing, China