1. Department of Nursing, School of Health Sciences, Faculty of Medicine, Kagoshima University, Kagoshima 890-8544, Japan
2. Department of Nursing, Kagoshima Prefectural Oshima Hospital, Amami 894-0015, Japan
3. Department of International Island and Community Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima 890-8544, Japan