1. Department of Clinical Epidemiology, Hyogo Medical University, Japan
2. Department of Neurosurgery, Hyogo Medical University, Japan
3. Faculty of Medicine, School of Health Sciences, University of the Ryukyus, Japan
4. Department of Infectious Diseases, Shimane Prefectural Central Hospital, Japan
5. Shimane Prefectural Central Hospital, Japan
6. Department of Clinical Pharmacology and Therapeutics, University of the Ryukyus, Japan