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World Health Organization 2007, Only 100% smoke-free environments adequately protect from dangers of second-hand smoke, last modified 29 May 2007, http://www.who.int/mediacentre/news/releases/2007/pr26/en/index.html, accessed 17 Jul 2009.http://www.who.int/mediacentre/news/releases/2007/pr26/en/index.htmlExternal Link
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