1. The evolution of the randomized controlled trial and its role in evidence-based decision making;Devereaux;J Intern Med,2003
2. The Nuremberg Code, research ethics guideline. http://www.hhs.gov/ohrp/references/nurcode.htm; last day of access: Nov 17th, 2010.
3. The Declaration of Helsinki, research ethics guideline. http://www.ohsr.od.nih.gov/guidelines/helsinki.html; last day of access: Nov 17th, 2010.
4. The Belmont Report, research ethics guideline. http://www.ohsr.od.nih.gov/guidelines/belmont.html; last day of access: Nov 17th, 2010.
5. The ICH harmonized tripartite guideline—guideline for good clinical practice. http://www.gcppl.org.pl/ma_struktura/docs/ich_gcp.pdf; last day of access: Nov 17th, 2010.