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Association for Prevention Teaching and Research, Washington, USA
Journal, Elsevier inc., Amsterdam, Netherlands, free summaries, paid full-text papers
American College of Preventive Medicine, Washington, USA
The Canadian Task Force on Preventive Health Care, Ottawa, Canada
Book, Centers for Disease Control and Prevention, Atlanta, USA
U.S. Department of Health and Human Services, Rockville, USA
Book, National Academy Press, Washington, USA, published 2005