1. Graduate School of Comprehensive Human Sciences University of Tsukuba Tsukuba Japan
2. Department of Primary Care and Medical Education Faculty of Medicine University of Tsukuba Tsukuba Japan
3. Faculty of Medicine University of Tsukuba Tsukuba Japan
4. Johns Hopkins International Injury Research Unit Department of International Health Johns Hopkins Bloomberg School of Public Health Baltimore MD USA
5. Center for Fundamental Education Teikyo University of Science Tokyo Japan
6. Department of Nursing School of Health Sciences Ibaraki Prefectural University of Health Sciences Ami Japan
7. Center for Medical Sciences Ibaraki Prefectural University of Health Sciences Ami Japan