1. Department of Medical Statistics, Graduate School of Medicine Osaka City University Osaka Japan
2. Department of Nursing Osaka City University Hospital Osaka Japan
3. Department of Nursing Kobe City Medical Center General Hospital Kobe Japan
4. Department of Nursing Teine Keijinkai Hospital Hokkaido Japan
5. Department of Nursing Kyoto University Hospital Kyoto Japan
6. Department of Acute and Critical Care Nursing, School of Nursing Sapporo City University Sapporo Hokkaido Japan