1. Department of Emergency and Critical Care Medicine, Dokkyo Medical University, Tochigi 321-0293, Japan
2. Data Science Center, Jichi Medical University, Tochigi 329-0498, Japan
3. Department of Public Health, School of Medicine, Dokkyo Medical University, Tochigi 321-0293, Japan
4. Department of Adult Nursing, School of Nursing, Dokkyo Medical University, Tochigi 321-0293, Japan
5. Center for Research of the Aging Workforce, University of Occupational and Environmental Health, Fukuoka 807-8555, Japan