Department of Blood Transfusion, Beijing Tiantan Hospital, Capital Medical University, No. 119 South Fourth Ring West Road, Fengtai District, Beijing, 100070, China. Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No. 119 South Fourth Ring West Road, Fengtai District, Beijing, 100070, China; China National Clinical Research Center for Neurological Diseases, No. 119 South Fourth Ring West Road, Fengtai District, Beijing, 100070, China. Department of Blood Transfusion, Beijing Tiantan Hospital, Capital Medical University, No. 119 South Fourth Ring West Road, Fengtai District, Beijing, 100070, China. Electronic address: cyoanan_jms@163.com.