Centre for Health Economics and Policy Analysis;
Department of Clinical Epidemiology and Biostatistics;
and Department of Political Science;
McMaster University;
1200 Main St. West;
HSC-2D3;
Hamilton;
ON;
Canada;
L8N 3Z5;
Health Evidence Network;
World Health Organization Regional Office for Europe;
Scherfi gsvej 8;
Copenhagen;
Denmark DK-2100;
Norwegian Knowledge Centre for the Health Services;
P.O. Box 7004;
St. Olavs plass;
N0130 Oslo;
Norway;
Health Systems Research Unit;
Medical Research Council of South Africa;
Section for International Health;
Institute of General Practice and Community Medicine;
Faculty of Medicine;
University of Oslo;
Norway;
