1. 1) World Medical Association. WMA Declaration of Helsinki: ethical principles for medical research involving human subjects. Adopted by the 18th WMA General Assembly, Helsinki, Finland, June 1964, and last amended by the 64th WMA General Assembly, Fortaleza, Brazil, October 2013. [http://www.wma.net/en/30publications/10policies/b3/index.html (accessed 2014-2-24)]
2. 4) Parsa-Parsi R, Blackmer J, Ehni HJ, Janbu T, Kloiber O, Wiesing U. Reconsidering the Declaration of Helsinki. Lancet. 2013; 382(9900): 1246-7.
3. 5) World Medical Association. Press Release: WMA Publishes its Revised Declaration of Helsinki. Oct 19, 2013. [http://www.wma.net/en/40news/20archives/2013/2013_28/index.html (accessed 2014-2-24)]