National Cerebral and Cardiovascular Center Research Institute - Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Centre - Center for Advancing Clinical and Translational Sciences, National Cerebral and Cardiovascular Centre - Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Centre, Nippon Medical School, National Cerebral and Cardiovascular Centre - Office of Biostatistics and Data Management, Institute of Brain and Blood Vessel Mihara Memorial Hospital, Yamagata City Hospital Saiseikan, Obihiro Kosei Hospital, Kohnan Hospital, Nakamura Memorial Hospital, Gifu University, Akita University, Saga University - Faculty of Medicine, Niigata City General Hospital, Kyoto Second Red Cross Hospital, Tokai University, National Hospital Organization Kyushu Medical Center - Departments of Cerebrovascular Medicine and Neurology, Iwate Prefectural Central Hospital, Nagasaki University, Toyota Memorial Hospital, Ohnishi Neurological Center, Kawasaki Medical School, Tokushima University, St. Marianna University, Kyorin University, Kobe City Medical Center General Hospital - Department of Neurosurgery, Steel Memorial Yawata Hospital, Toranomon Hospital, Hyogo College of Medicine, Juntendo University, St. Marianna University, National Cerebral and Cardiovascular Centre - Department of Neurology, Kyushu University, Iwate Medical University, National Cerebral and Cardiovascular Centre, National Cerebral and Cardiovascular Centre - Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Centre - Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Centre, Nippon Medical School, National Cerebral and Cardiovascular Centre - Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Centre - Department of Cardiovascular Medicine and Independent