1. Department of Neurosurgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
2. Department of Infectious Disease, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
3. Department of Otolaryngology – Head and Neck Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan