1. Use of invasive placebos in research on local anaesthetic interventions;McGuirk;Anaesthesia,2011
2. World Medical Association World Medical Association Declaration of Helsinki: Ethical Principles for Medical Research Involving Human Subjects 2008 http://www.wma.net/en/30publications/10policies/b3/17c.pdf
3. Sham procedures and the ethics of clinical trials;Miller;Journal of the Royal Society of Medicine,2004
4. Complications occurring from diagnostic venipuncture;Galena;Journal of Family Practice,1992
5. American Medical Association Report of the Council on Ethical and Judicial Affairs: Surgical “Placebo” Controls http://www.ama-assn.org/ama1/pub/upload/mm/code-medical-ethics/2076a.pdf