Preamble to the Constitution of the World Health Organization as adopted by the International Health Conference, New York, 19–22 June 1946 and signed on 22 July 1946 by the representatives of 61 States (Official Records of the World Health Organization, No. 2: 100) and entered into force on 7 April 1948 [http://www.who.int/about/definition/en/] Accessed 7 June 2006