Alhusain Nagm1,2, Ahmed A Negm3. 1. Department of Neurosurgery, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan. nagm@shinshu-u.ac.jp. 2. Department of Neurosurgery, Al-Azhar University Faculty of Medicine-Nasr city, Cairo, Egypt. nagm@shinshu-u.ac.jp. 3. Department of Rheumatology, Physical Medicine and Rehabilitation, Faculty of Medicine, Al-Azhar University, Cairo, Egypt.