1. Department of Nursing at the Hunan University of Medicine; Huaihua China
2. McLaughlin Centre for Population Health Risk Assessment; Institute of Population Health; University of Ottawa; Ottawa ON Canada
3. OMNI Research Group; Department of Obstetrics and Gynecology; Faculty of Medicine and Clinical Epidemiology Program; Ottawa Hospital Research Institute; University of Ottawa; Ottawa ON Canada
4. Clinical Epidemiology Program; Ottawa Hospital Research Institute; Ottawa ON Canada