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10. World Health Organization. Fact Sheet Nº 213. Blindness : Vision 2020- The global initiative for the elimination of avoidable blindness. http://www.who.int./mediacentre/factsheets/fs213 (rev. 02/2000).
10. World Health Organization. Fact Sheet Nº 213. Blindness : Vision 2020- The global initiative for the elimination of avoidable blindness. http://www.who.int./mediacentre/factsheets/fs213 (rev. 02/2000).
