The Cochrane Collaboration
Medical Research Council, United Kingdom
Department of Health and Ageing, Australia
Monash University, Australia
National Health Service Research and Development Programme, United Kingdom
Health Research Board, Ireland
National Institute of Public Health, Norway
Copenhagen Hospital Corporation, Denmark
Health Services Research and Development Service and the University of Texas Health Science Center, San Antonio, USA
US Veterans Health Administration, USA
Oxford Regional Health Authority, UK
Nuffield Provincial Hospitals Trust, UK
LW Frohlich Fund, USA
Norwegian Ministry of Health and Social Affairs, Norway
Norwegian Research Council, Norway
Glaxo Wellcome, Norway