1. Women's College Hospital; Department of Family Medicine; 76 Grenville Street Toronto ON Canada M5S1B2
2. Norwegian Knowledge Centre for the Health Services; PO Box 7004, St. Olavs Plass Oslo Norway N-0130
3. Sydney School of Public Health, University of Sydney; Cancer Epidemiology and Services Research; Room 205, Queen Elizabeth II Research Institute (DO2) University of Sydney Camperdown Australia NSW 2006
4. University of Melbourne; Primary Care Research Unit; 200 Berkeley St Carlton VIC Australia 3010
5. University of Toronto; Department of Family and Community Medicine; 500 University Avenue Fifth Floor Toronto Ontario Canada M5G 1V7
6. Norwegian Knowledge Centre for the Health Services; Global Health Unit; P.O. Box 7004, St. Olavs plass Oslo Norway N-0130
7. Ottawa Hospital Research Institute; Clinical Epidemiology Program; 1053 Carling Avenue Ottawa ON Canada K1Y 4E9
8. University of Ottawa; Department of Medicine; Ottawa ON Canada