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April 7, 2013 is World Health Day. The theme this year is High Blood Pressure. High blood pressure is a serious medical condition that significantly increases the risk of heart and kidney disease. As many sufferers have no symptoms, it is known as the silent killer.
The link for the World Health Organization provides more information.
http://www.euro.who.int/__data/assets/pdf_file/0004/185917/Fact-sheet-World-Health-Day-2013-Eng.pdf