References
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- International Ethical Guidelines for Biomedical Research Involving Human Subjects. 1993; Council for International Organizations of Medical Sciences and the World Health Organisation: Geneva.
- N.A. Halsey, A. Sommer, D.A. Henderson. Ethics and international research (editorial). BMJ. 315: 1997; 7114.
- S. Prabhakaran. Mothers give support to placebo trials. Mail and Guardian. 1997. 1 October, Johannesburg.