1. Department of NursingTokyo Healthcare University Tokyo Japan
2. Department of NursingUniversity of Occupational and Environmental Health Fukuoka Japan
3. Women's Health and Midwifery Graduate SchoolSt. Luke's International University Tokyo Japan
4. Graduate School of MedicineChiba University Chiba Japan
5. Graduate School of Health and Welfare ScienceInternational University of Health and Welfare Fukuoka Japan
6. St. Luke's International University Tokyo Japan