1. Department of Neurological Surgery, Aichi Medical University, Karimata Yazako, Nagakute, Aichi-gun, Japan.
2. High Technology Research Center, Pharmacology, Showa Pharmaceutical University, Tokyo, Japan.
3. Department of Anatomy II, Fujita Health University School of Medicine, Aichi, Japan.
4. Department of Neurosurgery, Nagoya University Graduate School of Medicine, Aichi, Japan.