World Health Organization (WHO).
WHO definition of health. Preamble to the Constitution of the World Health Organization as adopted by the International Health Conference, New York, June 19–22 1946; signed on July 22, 1946, by the representatives of 61 States (Official Records of the World Health Organization, no. 2, p. 100) and entered into force on April 7, 1948.
http://www.who.int/about/definition/en/print.html . Accessed October 1, 2014
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