1. Xiangya School of Nursing Central South University Changsha Hunan China
2. School of Nursing, Faculty of Health Science University of Ottawa Ottawa Ontario Canada
3. Center for Research on Health and Nursing University of Ottawa Ottawa Ontario Canada
4. School of Epidemiology and Public Health, Faculty of Medicine University of Ottawa Ottawa Ontario Canada
5. Ottawa Hospital Research Institute, University of Ottawa Ottawa Ontario Canada
6. Department of Nurse Anesthesia Virginia Commonwealth University Richmond Virginia USA