1. Department of Neurosurgery
2. Laboratory of Immunology, Faculty of Pharmacy; Osaka Ohtani University; 3-11-1, Nishikiorikita, Tondabayashi; Osaka 584-8540
3. Health Research Institute; National Institute of Advanced Industrial Science and Technology; 2217-14, Hayashi-machi, Takamatsu; Kagawa 761-0395; Japan