1. Department of Internal Medicine Hyogo Prefectural Tamba Medical Center Tamba Hyogo Japan
2. Division of Community Medicine and Career Development Kobe University Graduate School of Medicine Kobe Hyogo Japan
3. Department of Neurosurgery Hyogo Prefectural Tamba Medical Center Tamba Hyogo Japan
4. Department of Neurosurgery Kobe University Graduate School of Medicine Kobe Hyogo Japan