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2. World Medical Association: Ethical principles for medical research involving human subjects. 2008, Seoul Korea: Declaration of Helsinki 2008. 59th WMA General assembly, http://www.wma.net ,
3. Belmont Report: Ethical principles and guidelins for the protection of human subjects of research. 1979, Report of the National commission for protection of the human subjects of biomedical and behavioral research, http://www.hhs.gov/ohrp/humansubjects/guidance/belmont.html ,
4. International ethical guidelines for biomedical research involving human subjects. 2002, Geneva: Concil for international organization of medical sciences (CIOMS) in collaboration with World Medical Organization (WHO), http://www.cioms.ch/publications/laout_guide 2002/pdf
5. Nuffield council, Nuffield Council on Bioethics: The ethics of research related to healthcare in developing countries. 2002, Nuffield council