“The World Health Organization (WHO) is a specialized agency of the United Nations (UN) that acts as a coordinating authority on international public health. Established on April 7, 1948, with its headquarters in Geneva, Switzerland, the agency inherited the mandate and resources of its predecessor, the Health Organization, which was an agency of the League of Nations.”
From Wikipedia: http://en.wikipedia.org/wiki/world_health_organization
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World Health Organization Home
http://www.who.int/
World Health Organization (WHO) Research
http://www.who.int/research/en/
Health Reform Trends, Research and Analysis 
