1. United States Preventive Services Task Force,1996
2. Treating Tobacco Use and Dependence. Clinical Practice Guideline;Fiore,2000
3. A Manager's Guide to the Design and Conduct of Clinical Trials;Good,2002
4. United States Department of Health Human Services. Code of Federal Regulations, TITLE 45, Public Welfare, PART 46—Protection of Human Subjects (45 CFR 46). Washington DC: Office for Protection from Research Risk (NIH); revised June 18, 1991 [effective August 19, 1991; cited July 17, 2007.]. Available from: http://www.hhs.gov/ohrp/humansubjects/guidance/45cfr46.htm. Accessed August 15, 2007.
5. National Commission for the Protection of Human Subjects in Biomedical and Behavioral Research. The Belmont Report: Ethical Principles and Guidelines for the Protection of Human Subjects of Research. Washington, DC: National Institutes of Health (Office for Human Research Protections); April 18, 1979 [cited July 17, 2007]. Available from: http://ohsr.od.nih.gov/guidelines/belmont.html. Accessed August 15, 2007.