1. The Nuremberg Code (1947);BMJ,1996
2. World medical association declaration of helsinki: Ethical principles for medical research involving human subjects;JAMA,2013
3. The Belmont Report: Ethical Principles and Guidelines for the Protection of Human Subjects of Research,1979
4. Council for International Organization of Medical Sciences (CIOMS):International Ethical Guidelines for Biomedical Research Involving Human Subjects. Avenue Appia 20, CH1211 Geneva 27, Switzerland: CIOMS, c/o WHO: 2002.
5. International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use: ICH harmonized tripartite guideline. Guideline for good clinical practice E6. ICH 1996. Avialable: http://wwwichorg/fileadmin/Public_Web_Site/ICH_Products/Guidelines/Efficacy/E6/E6_R1_Guidelinepdf