1. Cardiff University; School of Healthcare Sciences; Eastgate House Cardiff Wales UK
2. Memorial University; School of Nursing; H2916, Health Sciences Centre 300 Prince Philip Drive St. John's NL Canada A1B 3V6
3. City, University of London; Centre for Health Services Research; Northampton Square London UK EC1V 0HB
4. City, University of London; School of Health Sciences; Northampton Square London UK EC1V 0HB
5. Ottawa Hospital Research Institute; Clinical Epidemiology Program; The Ottawa Hospital - Civic Campus 1053 Carling Ave, Box 693 Ottawa ON Canada K1Y 4E9
6. University of Ottawa; School of Epidemiology, Public Health and Preventive Medicine; Ottawa ON Canada