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http://www.rivm.nl/dsresource?objectid=rivmp:276940&type=org&disposition=inline&ns_nc=1
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http://whqlibdoc.who.int/publications/2003/9241562218.pdf?ua=1
3. Informe anual del Sistema Nacional de Salud 2012
http://www.msssi.gob.es/estadEstudios/estadisticas/sisInfSanSNS/tablasEstadisticas/InfSNS2012.htm
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