Erika Yamada

1   Department of Neurosurgery, Institute of Medicine, University of Tsukuba, Ibaraki, Japan

,

Yoshiro Ito

1   Department of Neurosurgery, Institute of Medicine, University of Tsukuba, Ibaraki, Japan

2   Division of Stroke Prevention and Treatment, Institute of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan

,

Masayuki Sato

1   Department of Neurosurgery, Institute of Medicine, University of Tsukuba, Ibaraki, Japan

2   Division of Stroke Prevention and Treatment, Institute of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan

,

Aiki Marusima

1   Department of Neurosurgery, Institute of Medicine, University of Tsukuba, Ibaraki, Japan

2   Division of Stroke Prevention and Treatment, Institute of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan

,

Mikito Hayakawa

1   Department of Neurosurgery, Institute of Medicine, University of Tsukuba, Ibaraki, Japan

2   Division of Stroke Prevention and Treatment, Institute of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan

,

Eiichi Ishikawa

1   Department of Neurosurgery, Institute of Medicine, University of Tsukuba, Ibaraki, Japan

,

Yuji Matsumaru

1   Department of Neurosurgery, Institute of Medicine, University of Tsukuba, Ibaraki, Japan

2   Division of Stroke Prevention and Treatment, Institute of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan

None.