1. Department of Epidemiology, Infectious Disease Control and Prevention, Graduate School of Biomedical and Health Sciences, Hiroshima University
2. Project Research Center For Epidemiological & Mega-data Analysis of New Research Area, Hiroshima University
3. Department of Neurosurgery, St. Marianna University School of Medicine
4. Department of Pediatrics, St. Marianna University School of Medicine
5. Department of Neurosurgery, Hiroshima University Hospital