1. Dalhousie University; Department of Community Health & Epidemiology; 5790 University Avenue Room 222 Halifax NS Canada B3H 1V7
2. Centre for Clinical Research; Nova Scotia Cochrane Resource Centre; 5790 Univesity Avenue Room 228 Halifax NS Canada B3H 1V7
3. VU University; Department of Health Sciences, Faculty of Earth and Life Sciences; PO Box 7057 Room U454 Amsterdam Netherlands 1007 MB
4. National Institute for Health and Welfare (THL); Centre for Health Economics CHESS; PO Box 30 Mannerheimintie 166 Helsinki Finland FI-00271